Terrible - warranty no response from Hisense

I bought a 70" smart tv in Sept 2021. My tv now has no picture nor sound, just blue and white lines accross the screen. It also looks as if blue liquid is running down the top of the screen. I sent an email to *** on 11/8/2022 as this tv should still be under warranty. I have had absolutely no response on my email from Hisense, and when you call them you are no 25 in the queue and after holding for 11min, the queue doesn't drop in numbers. I tried calling 3 times today with the same story every time. I contacted my insurance company but they refuse to touch the tv as it is still under warranty. And me as the client have no tv and no response for more than 2 weeks now.