Disappointing Hisense after sales service

I am very disappointed in Hisense. We bought one 16 months ago believing it had a good after sales record. Unfortunately this was not the case. Just over 3 weeks ago our TV suddenly got no picture, only lots of vertical lines in different colors. Previous to that 2 horizontal lines had appeared but wasn't worrying us so we left it. We phoned the Hisense call centre who eventually collected the TV for repair after about 2 weeks. 10 days later now we are informed that the TV is going to be returned today. It was not repaired as they said it could not be. The guy who delivered it gave us a piece of paper saying we must take it back to the shop we bought it from and a new TV had been authorized. My husband did this, only to be told after the shop called Hisense, that we would not be receiving a new TV. We have been pushed from pillar to post and this is not acceptable. We are both pensioners and not in position to buy another TV after only 16 months that was still under guarantee. TV