Poor service Game pavilion

It sad to see such a big company with such poor customer service, i purchased 3 x Hisense tvs,In July 2022 the tv had a problem in December i took the tv in and the manger at the pavilion game say he can not do anything i need to contact hisense directly.....i've been try to contact hisense since 03/01/2023 and can not get hold off them ,i've sent a mail to the complaints of game ...they call to and say sorry but sent me a mails saying if i do not send them the serial no of the tv the will close the complaint on there side. it shows masstore them self at higher level have do not care about there customers and only care about the money.