OnePlus India — Green line on screen

My phone is OnePlus 8T, due to some technical issues my phone screen got one green line, when I checked online it's found that majority of people got the same problem, I mailed OnePlus support team but didn't get any reply, then I installed one plus support app, then diagnosis problem and book for a repair, but the app got message that "my phone warranty is over so I have to pay ₹12000 as repair cost", when I researched about this matter it's found that OnePlus company is sending bugs through software update so its very serious issue to discuss, by this way they mentally forcing everyone to buy new phone or to they will get repair cost.

It's an injustice from OnePlus india