Samsung Service Sucks!

Had a new Samsung QLED TV installed on 31/01/2020. Reported that it was faulty 5 days later on 05/02/2020. Samsung sent a technician to check the TV 2 days later on 07/02/2020. The Samsung technician admitted that the picture on the TV was terrible but assured me that it was a DSTV problem that affected all Samsung 4K TV's. I explained to him that if that was the case then I did not want the TV. He told me that someone from Samsung would contact me regarding a refund or exchange. I have since tested the TV on Youtube and Netflix and the picture quality is just as bad, so obviously it is not a DSTV issue. Someone from Samsung customer services called me a few days later. I told them that I either want a refund, or for the TV to be replaced. They told me that the issue had been passed on to their management team, and that I would be contacted soon. I have since called in 3 more times to find out the status of my fault but nobody can give me an answer and despite numerous promises nobody has even bothered to get back to me. I would strongly advise everybody against purchasing Samsung TV's.