shadow on iphone 11 screen

2 days ago while using my phone, ı saw a shadow on the top left of the screen Then, when ı did research, I sawthat it had happened to many people.Then I went to the authorized apple serv ice.When I explained the problem,they were ready to replace a new screen for me ıt was under warranty the gave me information and ı did not accept it. Then while my screen was going to be changed in 1 hours,it would harm my school life and lessons because i had to make a presentaiton. i did not put the phone down This is ridiculous. that shadow always catches my eye Even though ı had a 4 month warranty, my problem was not solved. Even the screen replacement was not effective for everyone. While there are people who live after the screen replacement. ı would wait to be given a new phone in a sealed box. I would suffer greatly in terms of school. 1 week is long time.(Its the visual representaiton, my problem is in the upper left)