Macbook Pro 2012 Retina Won't Start, burnt power pins on power port, digital artist dead in the water

After a year of owning my macbook pro late 2012 retina model, it started having difficulty charging, it wouldn't charge even when green on the magsafe, and had difficulty turning orange, basically right after the 1 year warranty was over by one month, I went into the apple store and they told me that I simply needed to replace the power adapter and cord and it would be fine, but that it most likely was caused by me plugging it into a power strip, and that I had to plug it directly into the wall in its own power slot, which they never said that was what you were supposed to do when I purchased the laptop and could not find it anywhere in the literature. It was fine in the store for the apple worker, but after even just a few months I had to to constantly twist and unplug and replug the magsafe adapter from different angles just to get it to work, and it was like a living ****, as I am a digital artist and my wacom tablet will not work until my macbook pro is charging and the magsafe is orange, so everyday I would waste 30 minutes to an hour with the finicky magsafe, until recently my macbook pro will not turn on at all.
Since the problem arose after warranty I had to pay out of pocket for the replacement magesafe cord, which was a temporary solution, I pointed out that the magsafe power port on the laptop itself also had burn marks just like the magsafe cord that had a few pins pushed in and was slightly blackened but the attendant ignored that and said it was fine and just swapped out the cord. The "genius" attendant claimed if I just plugged in the macbook pro directly into the wall, everything would be fine and back to normal, and I did just that, I never plugged it into a power strip ever again, and still we arrive to my current predicament.
I believe I have to repair the actual power port the magsafe plugs into on the laptop, and get a new magsafe cord all over again, but it will be much more expensive than simply swapping out a cord this time, and I don't think the reason this happened to begin with has been truly identified, and I'm worried I have to make this repair every year, and I can't afford this kind of planned obsolescence, and I thought I was getting the best laptop in the world, and it was, everything was perfect not one single problem, except for this power issue, which now won't even allow me to use the computer at all and is now a giant paper weight, and leaves a dirty taste in my mouth when it comes to apple products.
I live in San Francisco in a house that was built around 1910 and don't know much about what or when renovations were made for power, but I have a feeling some kind of incorrect voltage is happening, and I was never instructed on this, and every other macbook is fine, my roommates have earlier models like the 2007 and 2009 MacBooks and have no problem like mine.
Please help me

I don't understand why and how the red light in the audio jack is still on while the computer is totally off, not connected to any power source and the battery seems to be empty... how is taht possible?
Because the battery is not empty, something is messed up, likley the SMC.
All I can advise is doing a SMC Reset, which resets the power firmware in case it got messed up and hopefully that will charge the battery up like normal.
If you can't do it or it doesn't work tommorow after charging up (turned off) overnight then just take it to Apple.
https://support.apple.com/kb/ht3964

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Below are instructions to enter UNIX shell commands. The commands are safe and do nothing but produce human-readable output, but they must be entered exactly as given in order to work. If you question the safety of the procedure suggested here — which you should — search this site for other discussions in which it’s been followed without any report of ill effects. I am not asking you to trust me. If you can't satisfy yourself that these instructions are safe, don't follow them.
The commands will line-wrap or scroll in your browser, but each one is really just a single long line, all of which must be selected. You can accomplish this easily by triple-clicking anywhere in the line. The whole line will highlight, and you can then copy it.
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Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
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☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
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Step 1
Triple-click anywhere in the line of text below on this page to select it:
PB=/usr/libexec/PlistBuddy; PR () { [[ "$o" ]] && printf '\n%s:\n\n%s\n\n' "$1" "$o"; }; PF () { o=$($PB -c Print "$2" | awk -F'= ' \/$3'/{print $2}'); PR "$1"; }; { o=$(( $(vm_stat | awk '/Pageo/{sub("\\.",""); print $2}')/256 )); [[ $o -gt 1024 ]] && printf "\nPageouts: %s MiB\n\n" $o; o=$(kextstat -kl | grep -v com\\.apple | cut -c53- | cut -d\< -f1); PR "Loaded extrinsic kernel extensions"; o=$(launchctl list | sed 1d | awk '!/0x|com\.apple|org\.(x|openbsd)|\.[0-9]+$/{print $3}'); PR "Loaded extrinsic user agents"; o=$(launchctl getenv DYLD_INSERT_LIBRARIES); PR "Inserted libraries"; o=$(crontab -l); PR "User cron tasks"; o=$(cat /e*/lau*); PR "Global launchd configuration"; o=$(cat ~/.lau*); PR "Per-user launchd configuration"; PF "Global login items" /L*/P*/loginw* Path; PF "Per-user login items" L*/P*/*loginit* Name; PF "Safari extensions" L*/Saf*/*/E*.plist Bundle | sed 's/\..*$//;s/-[1-9]$//'; o=$(find ~ $TMPDIR.. $ -flags +sappnd,schg,uappnd,uchg -o ! -user $UID -o ! -perm -600 $ | wc -l); [[ $o -eq 0 ]] || printf "\nRestricted user files: %s\n\n" $o; cd; o=$(find -L /S*/L*/E* {,/}L*/{A*d,Compon,Ex,In,Keyb,Mail/Bu,P*P,Qu,Scripti,Servi,Spo}* -type d -name Contents -prune | while read d; do ID=$($PB -c 'Print :CFBundleIdentifier' "$d/Info.plist"); ID=${ID:-No bundle ID}; egrep -qv "^com\.apple\.[^x]|Accusys|ArcMSR|ATTO|HDPro|HighPoint|driver\.stex|hp-fax|JMicron|microsoft\.MDI|print|SoftRAID" <<< $ID && printf '%s\n\t(%s)\n' "${d%/Contents}" "$ID"; done); PR "Extrinsic loadable bundles"; o=$(find /u*/{,*/}lib -type f -exec sh -c 'file -b "$1" | grep -qw shared && ! codesign -v "$1"' {} {} \; -print); PR "Unsigned shared libraries"; for d in {,/}L*/{La,Priv,Sta}* L*/Fonts; do o=$(ls -A "$d"); PR "$d"; done; } 2> /dev/null | pbcopy; echo $'\nStep 1 done'
Copy the selected text to the Clipboard by pressing the key combination command-C. Then click anywhere in the Terminal window and paste (command-V). I've tested these instructions only with the Safari web browser. If you use another browser, you may have to press the return key after pasting.
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Step 2
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You can then quit Terminal.
To prevent confusion, I'll repeat: When you type your password in the Terminal window, you won't see what you're typing.
Note: If you don’t have a login password, set one before taking Step 2. If that’s not possible, skip the step.
Important: If any personal information, such as your name or email address, appears in the output of these commands, anonymize it before posting. Usually that won't be necessary.
Remember, Steps 1 and 2 are all copy-and-paste — type only your password. Also remember to post the output.

Macbook Pro 2012 Retina Won't Start, burnt power pins on power port, digital artist dead in the water

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