OnePlus India — OnePlus 8 Pro Display Lining Issues

I have the OnePlus 8 Pro (12/256 GB). After a software update, green lines started appearing on my display and there are 3 of them on my display due to which it's unusable at the moment. I visited the nearest service center to me in Rourkela where they said the phone has no physical damage and they could repair it for free if authorised by an exclusive service center. So, when I visited Delhi for work, I got the chance to visit the Connaught Palace Service center. There they said, even if the phone has 0 physical damage, they won't repair it for free( free repair is only for 8T and 9R). They even said free service was there before but has been discontinued and that the charges will be 16.7k. I am not willing to pay anything for an issue caused due to a software updation problem. Looking for a swift resolution into the matter.