Hewlett-Packard — Poor service

There's a vertical line in my display 3cm9011537 for that i logged a complaint in hp customer support at 07/08/2020 and service provider give me a case i'd [protected] and make me believe my problem will resolve in 48hours but. But still there's no any response from customer support and i had complain many time but still my problem will not resolve.
My help me