Samsung - Samsung TV Display issue

*. We had bought a Samsung ** inches QLED TV, suddenly it started developing black lines on screen with out any external damage.
*. We request service centre for the check, but without doing any check internally they directly said that tv panel will be replaced and took ***Rs. as visiting charges.
*. Upon Asking reason they said, it happened due to rainy season, voltage issue or excessive usage issue. *. Our take is if it is due to rainy season then this issue will come every year, then definitely its the issue from samsung end.
*. If its excessive usage issue then samsung should tell how much Hours we need to watch every day clearly on their advertisement and limitation of their product.
*. If its due to voltage issue then we have other appliances also running and also samsung should advertise to use the stabilizer with their product if such is the case.
*. Upon escalating this matter to Samsung CEO helpdesk, samsung had offered us a **% refund by telling that its the TV DNA issue which cannot be fixed and we agreed to this refund and our case was closed by the samsung customer care on this basis of the agreement.
*. But after doing all the documentation and waiting almost for * month , at the end samsung denied it, calling now it now its not the DNA issue its the panel issue and can be fixed.
*. Samsung Service centre just fooling and trying to stretch our case as much as possible. They do not even visited our home at agreed date and blamed us that we didnt called them and closed our case.
**. Samsung service centre using loop holes to reject our service, by initiating a cancellation request, and then if customer doesnt reply on that, request will be autoclose.
**. We are already very much frustrated with how such big brand is dealing, they are just giving us lame reason and prolonging our case.
**. Also there are lot of other cases of such issue in samsung community forum but samsung is failing to adrress them and using customers as money making machine for the issue which they are responsible.