Hisense TV breaks every 2 months

I bought a Hisense 50" TV in May of 2015 from Game store Bloemfontein. The TV has a 2 year Game warranty and then another 2 year extended Hisense warranty. In October of 2017 the TV all of a sudden had no visual and only audio. I logged this with Hisense and a job cart was send to me and an approved Hisense repaired was authorized to fix the TV. After I received the repaired TV back again the same thing happend again in January of 2018 (only 3 months after the first repair was done) and a second job repair was issued with a different repairer. Again it took almost 10 days to fix. And then last nigh 22/02/2018 the same thing happened for the 3rd time in 4 months. Once again it was re-booked and taken for repairs. This is totally unacceptable and I demand a refund in credit from Hisense. I refuse to be given back a so called "repaired" TV that will break again in 2 months time. I phoned Hisense and asked to speak to the person in charge of credit refund and the lady told me there is no contact details for them, only emails, this is very unprofessional. I am awaiting your soonest response to the above!!!!