My WIFI keeps on disconnecting and even after reporting and suggestion by support the phone hasnt been replaced or repaired under warranty

Question

I think I have had enough. So its been a long time back and forth between me and you. Since I am not getting any solution and same thing you guys are providing me again and again.
I want to take a step back and list down a few things which have happened so far :-  
I started chatting with the apple support on this issue starting September - please refer back to your chats on this Serial Number.
I have factory reset my phone like 20 times since then as each time they asked me to follow few steps which made me loose my data as your icloud doesn't work properly as stated by your customer care support people itself that sometimes the back up doesn't happen so please take back up at your laptop too.
Send phone diagnostics by clicking on a link.
reset your WIFI settings
Call apple support after 24 hours of observation.
Next day when same issue occurs then extreme Apology.
Take Back up on computer and Icloud both and contact apple support once its done
Call apple support again.
Factory Reset by erase all contents and setting options. Once one call back again.
wait and analyse for a whole day after setting up apple ID and data.
Wifi Issue stil exists.
Call apple support again
Between all this I had to explain the issue each time to a new representative. This above process I have gone through at least 7-8 times. Please go and refer your call notes.
So finally i got to know after escalating it several times and one of your supervisors told me that the issue is a hardware issue and it can only be replaced as they have tried it all.
Supervisor assured me that he has recommended it to be replaced in notes and asked me to visit a center.
I called in local distributor and set up an appointment, unfortunately couldnt make it. So call them to reschedule as I am working women so i dont have all the time in life to keep interacting with associate after associate so thought of walking in to an apple store near by and lodge a complaint. The supervisor updated me that I have warranty left and it will be replaced without any cost and also if i report and issue in warranty and if apple is not able to resolve it so the warranty stands true until its completely resolved after customer's consent.
I went in to give my phone to the tech support and they kept it for analysis and came back saying the issue doesnt exist. I was getting a disconnection in my WIFI every now and then. My Data plan was always used and i fortunately have a proof of that.
Customer rep told me talk to apple support and if they say we will replace it. One more place added where customer has to go.
Now and back to square one - They say phone is damaged - we cant replace it. First of all the phone is not damaged and you guys are just finding reasons to not replace a faulty phone.
It randomly disconnects and its listed as a known issue on your website too. had this not been listed i would have never thought its the phone. Then I started to observe that its the phone that makes a disconnection and not the WIFI connections as it was everywhere home, office and at friends place.
Best i can do is call you guys when this happens if you guys promise me that the tech employee of apple can come to whatever location i suggest at that point and do not be surprised if the phone behaves normal when the person arrives as its random.
Now you want pictures of my phone and you want to analyse further.

Answer 1

After making an appointment and waiting over a week I was a few minutes late for my appointment I was told by apple I would have to make a new appointment. The shop was Chatswood in Sydney and the manager Mathew was very pathetic. I travelled 1 hour each way and was treated very poorly I must comment and say this was my first Apple devices and I will never understand how come people are buying these devices. The apps seem really good if only the hardware and the support could match. I really wish this manager all his best to Matthew in his next position somewhere else he obviously should not be in the position of managing an Apple store.