Digicable — DTH set top channel issues

I have been using Digicable set top since past two years. Eventually all the channels we preferred to watch started getting distorted one by one and then went blank. They were removed from the list of channels later. The problem still persists. The local cable company says it's not their fault and donot take calls unless when they come to take money. We pay our bills on time and still we have to face this problem. I would like this issue to get resolved immediately.