Iphone glitchy after repair. Need help Please.

Question

So I cracked my screen at the gym over two months ago. WEIGHT fell on it, yeah pretty %^## dumb.
Saw it was 269.00 for repair, I was afraid.
My friend said he would do the repair for 120 with a year warranty, still to expensive.
I started watching DIY videos, and thought it was pretty easy.
I bought a screen from china, 55 $ and extra spare parts for 22 $ , all in US$.
Got it two weeks later, I ripped the proximity sensor cable, replaced the screen without speaker, proximity, camera. Phone and screen worked. Except it was glitching all the time.
My keyboard would press on the wrong letters most of the time, my ability to zoom was screwed up.
So I returned it, another 14US down, waiting for a refund.
Bought another one of Ebay, from US seller, for 50$, and placed an order for proximity and camera cable for 5 $USD.
Got it, fixed it, worked well, STILL gltichy, but less than before. This time the phone worked amazingly for two days, then it got back to its habits.
Already down MORE THAN 150USD$.
Now my question is, why is this happening, all digitizer and screens are the same, carriers do not matter, (they say the screen will only work on sprint, at&t, etc) I live in canada.
My broken was perfect no problems with the phone, except it was hard to see and type because of the million cracks.
I have already resetted the phone, but still same thing.
HELP, What should I do ?

Answer 1

iDevices are not user servicable.
Opening of the device by anyone other than Apple (or an Apple Authorized Service Center) voids the warranty and all rights to support from the carrier and these user to user support forums.
Take the device to someone that is knowledgable and have them repair the device properly or replace it.
Apple does not sale parts for any iDevice.