OnePlus India — Deficiency of service/Refusal to take liability being the service provider resulting in loss of time and money

In the month of October 2022, I received a notification regarding system update on my phone which is very usual.
Therefore I updated my phone on that day like i always did assuming that the phone will get optimized thereafter. But surprisingly, as soon as I switched on my mobile phone after the update was done successfully, there was a vertical green ledger line visible on the screen of my phone which never appeared before, except for this time after the update.
I tried to resolve the issue by restarting/rebooting the phone several times but the issue didn’t resolve. Furthermore, when I researched about the issue then I came to know that the android cell phones of your company are facing the same trouble because of the update.
I later approached your service center located at LG-S-40/41/42/43 & 44, Seawoods Grand Central Mall, Plot bearing No. R-1 in Sector 40 Node Nerul, Seawoods Railway Station, Navi Mumbai, Maharashtra 400706, to state my grievance regarding the mobile phone, where I narrated everything to claim the service as the trouble/issue arisen was company's default. But the service center was extremely non-reciprocal towards me and denied to repair the defect that occurred in the mobile phone by stating the reason that the service center doesn’t have the policy to repair the product i.e. mobile phone model name 1+ 7 pro and that the service center had never received any complaint related to the said mobile phone model name 1+ 7 pro ever from any client in or across the area, therefore the service center won’t offer any service to me as per the terms and policies of the service center.