Samsung — Display issue die to software update

Brand : Samsung
Model : S20+
One day I received a update for my mobile after installation i observed a green line on my mobile at right corner after two days the display is not working and it turns into white.
I went to customer care and explained everything they told me like that need to change display and the cost of display is above 18000Rs. And i give for change the display after that I heard a notification from samsung like replacing display for free due to bug in twitter, I raise a complaint on that on issue and I submitted the bills also but they are not responding
Please help me on this

Thanks
vamsi krishna