Green Line on iPhone XS

Hi, sometime ago a vertical green line appeared on my iPhone XS and no matter what I did (restart, adjust brightness etc.) I could not make it disappear.

I took my phone to my local Apple Store in Istanbul, but they denied even to check my device! I also visited an authorized service provider, but they refused to replace/fix my device because it was bought from another country (Czech Republic) !

I cannot travel to Czech Republic because of COVID-19 and I can not get my iPhone repaired in my resident country, I need help!