Best Home and Electric /Warranty Claim

Good day, My name is Brian Powell . I recently bought a Sinotec Stl32 VN67D VN80D 32 INCh Led television at Best Home and Electric on the 1st of September 2017. I was very excited as i got an account by them even though i am a pensioner. The principal debt amount was for R3999.00. The total repay amount was calculated at R12'918.00 over a period of 30 monthly installment of R430.61 per month. I have contacted them because the television is problematic at this moment .The volume of the the television adjust automatically and the screen goes black some time. The sales person informed me that they cannot replace the television with a new one. They will send it away to the manufacturer to fix for which i must wait for 6 to 8 weeks.I have had the television for no longer than two months now. How do you pay so much for an item and you don't have any use for it and its problematic.