Apple - iPhone X got a green line on screen without any damage and apple not considering it

I have purchased iPhone X in June **** and phone was working properly. Without any damage I caused to the phone there was a green line popped up over night over the screen. I approached apple care and without testing the phone just looking at the screen they said it’s hardware issue and can get.a paid service because my warranty was expired * months ago. But I tried to explain them that I did not cause any damage due to which the problem occurred and they had to perform testing and see what went wrong. After that they did *mins testing for sake and still told same. Then I raised several complaints with apple care spent * hours on phone chat but still same response. They say they can understand issue but can’t help just bcoz warranty is not there. They r not ready to take the technology failure nor look into it. They gave me mental stress for a week saying they could find me a
Solution which they never did and was giving me
Same solution by wasting my time and money. I am really taking it
Seriously bcoz whatever happened with me
In this issue is not fair and that’s why I would like to fight for this.