Hisense bad service

I bought a hisense last year December and 2 weeks ago the tv screen went blank. I then went to game to take it back and was advised a technician will come out to fix it. The Tuesday I called the Cape town office and was advised the tech will call. Only the Wednesday the tech came and collected to tv and advised me it will take one day to get an answer. The next week Monday I called the technician and he didn't even look at the tv yet and said he will call when he can. Yesterday we called again to the Cape town office and was told the tech had a lot of job cards. I called again today and asked to speak to a manager. I was then advised the Cape town manager will call me and I am still waiting. How is the techs jobcards my problem and they are quick to tell you 7 day return but they can't fix the problems in 7 days. I will never buy hisense tv's again. This is horrible service. I am very disappointed as I have to call after these people.