Package changed from premier to R400 package

I changed from the Premier package to the half price package. Everything works fine for a week then you can only watch half the programmes. Last year the same happened when I downgraded. But once you upgrade to premier again no problem. The customer care always blame our decoder and our setup on the cables. But once they send out signals again it works fine again. Everytime I use up all my airtime for customer care to argue with me. You can never leave a complaint or speak to a supervisor. The problem is definately on their side but try to explain it to them. I feel that they only look after premier customers but now that you don't pay full price they don't need to look after you anymore. Its still my money half price or not and I expect a service for what I pay and not only for 5 channels.