Hisense don't care or listen to reason

I was told that Hisense Tv sets are SA made and their after service is iut of this world......after having dealt with LG which was awesome for me i thought lets give Hisense a go. I purchased a 50' Smart tv on 24/1/2019. We used the tv until the 31st of Jan and went on vacation from the 1st of Feb until the 19th of Feb. On the 26th of Feb the tv just gave a flickering red standby light but would not switch on. On Wednesday the 27th i logged a call with Hisense....the lady saying it will take a minimum of 3 working days before they can attend to my issue. I pleaded and said this is my only tv. On Friday 1st of March a tech came out and said the power supply was shot.......this after i have surge plugs everywhere in my house. He then told me that he has no parts and that he would have to order and this could take 3 to 4 workings days. I wrote a letter stating that i have lost my little trust that i have in the brand and politely requested that they credit Game stores with the amount that i paid.....R6500.00 and will gladly purchase another tv. I also gave them 24 hrs to call and email me..........no response....not even a read it receipt. I have effectively used the tv for 13 days and already it has packed up. The turn around times are unacceptable. I realy hope someone from Hisense will call me and see to my request as the 4 year warranty means nothing if my tv is going to pack up every second week.