Xiaomi India — Xiaomi 12 pro green line issue after software update

Iam using Xiaomi 12 pro mobile recently it got hyper os 2.0 i didn't update my self why because iam aware about greenline issues that's why but one fine day when I sleep it was updated automatically then now in display greenline was appeared . In my mobile there is no single scratch. But in service centre they are asking bill for approval but the bill was not available this mobile is gifted by my friend now he is no more but I know first activation date of device even I have all content of the box even manual too . No one can put bill after warranty period of 1 year but they are demanding and ignore to change display free of cost . The only problem occurs after software updates caused by the brand only without my permission now behave very rudely and not even give response so kindly request to help us .