Green line appeared on my iPhone XS Max screen

This line appeared after about a year after I have bought my iPhoneMax. It shown up after a update on my IOS. Then I updated again and it disappeared. Then I updated again(iOS 14.3) and it came back again.

I went to the Apple Technincal Support in Dublin and they told the phone was out of warranty and asked for 650,00 EUROS to fix that.

I called USA support to ask for the service for free as it's a problem with screen manufacturing/design.

The assistant denied to do the service for free even the problem is well-known and it's not bad usage of the product.

It's a shame Apple shows their back after you buy a very expansive product which has a factory-fault due to shows up after you update the iOS. Very disappointed with Apple.