Complaint TV not working under warranty

My big screen TV shows picture on one half and I contacted hisense customer service.They said it's under warranty after I sent them the relevant documents.they gave me ref number ********** 45,and sent me the email stating East coast appliances would uplift the TV and sort it out.this transpired on Saturday. Today Goolam from east coast appliances came with an assistant, they checked the TV, said it's a monitor problem and mustn't put it on. It won't work. They also tripped our power whilst checking it. He then said the repair is marked as closed, I will get an email which I must go with to game and he doesn't know if they will replace the TV.i think they did more damaged to the TV because they blew something and there was a spark and tripped our power. He said he would not take the TV as that's not his part of the problem. I emailed Bradley Sickle asking him exactly what is going on as these people didn't take the TV and gave me a different story.this TV was very expensive And is under warranty but no one from hisense has even called me back, yet they emailed me now saying that the repair is closed.