White death screen on, IPhone 13 Pro Max

Hello, Guyz. I need your help. I don't know what to do now,

last march 24, I updated my iphone 13 pro max ios to its latest version which is 16.3.1, after the phone had been updated it flickered a little bit of white across the screen and after 10-15 mins it turns white all over the screen.

I contacted the apple support to appeal on this issue, After 5days of waiting, they called me to inform me that my appeal is decline,

They say, If the ios update is the issue, I must update my ios to its latest vesrion which is ios 16.4, If it gonna fix it they gonna change my LCD. (What kind of reason is that? ). I just updated it now but nothing happens, it has gotten worse, it turns white,yellow and gray across the screen.

and the 2nd method is, To pay for the replacement.

3rd is, if the found out that the issue is ios update, they gonna refund my loss. ( which is you cant withdraw right? you'll spend it too with their product)

My concern is my Im reviewing for my board exam this coming last week of april, and my 85-90% lecture notes a save on my phone. Im out of my review pace now, I buy Apple product because of the  design of the chips that power its devices and allow them to be ever more powerful.

But for know, It Known for scamming people!!!!!!!!

Im fraustrated and depressed :(