I bought Tv in their store last year Black Friday in few weeks the sound stopped working I returned it then they promised to send it to repairs

I bought Tv in their store last year Black Friday in few weeks the sound stopped working I returned it then they promised to send it to repairs.tehy said after 21 days it will return so as im speaking my tv is still in their storeroom they didn’t take it to repairs and it been 2months now.i asked for my refund since well they didn’t send it to repairs because I can’t stay so long without it they refused.