Bad Customer Service from Sinotec and Game Rosebank

I bought a Sinotec TV at Game Rosebank about 2 years ago .The TV wont switch on and I reported the TV on the 10th of February ,to this day nothing has happened. I have phoned Game a million times ,nothing gets done ,Sinotec just confirmed to me yesterday to me that they cancelled my ticket, without telling me ,only found out when i followed up. The TV is under warranty,why am i being treated unfairly as a customer to both Sinotec and Game