Horrible customer service Game Gateway

I purchased a Hisense television from Game stores, my television is not coming on. I contacted Hisense and they have advised that my television is under warranty however they require my slip. The slip has faded, I have contacted Game Gateway and it has been more then 2 weeks and I have received no copy of slip. They keep saying that there is a backlog which I understand but they can't seem to provide me with any date that I would received this. I phoned them again on Saturday 24 April and the lady said she will contact me today Monday 26th April to let me know the status and I have received no phone call. I have a game store card which was used to purchase this television and can't understand why getting a copy takes this long. I'm also still paying for this television.