Not taking responsibility and Disgraceful Customer Service

On the 05/08/18, I booked in my 55" Hisense TV with HiFi Corporation in Fourways. The fault was the TV completely stopped working, no power at all. About 2 weeks later, I got an SMS from Hisense directly saying the unit was repaired. After me calling the store several times, I managed to get hold of someone who tells me that the inside panel is cracked and the TV is now out of warranty. Refusing to answer how that happened, told me to take it up Hisense. I called Hisense and they also not taking any responsibility. I called HiFi Corp again they tell me they will come back to me. Weeks of calling and leaving messages, I get no call back, Just over a month ago, I get hold of Neren at HiFi Corp. I explained everything to him and he promised to come back to me. I've been calling and leaving messages for him too and no call back. I guess HiFi Corp does this to hide behind why my TV is ruined with no explanation. I want a refund now. It's pathetic that HiFi Corp can treat clients this way. I will never buy anything from HiFi Corp again. Your after-sales service is disgraceful.