Explora desaster

I have had an Explora installed by an accredited installer 3 weeks ago. They connected my old hd pvr as an extra view decoder. Since the installation I have been frustrated with either no service or distorted service most of the time. Some channels work from time to time, but the popular ones and the ones we normally watch are a disaster. I have spent much time on the phone trying to resolve the problem with no luck. I contacted the installer and they came out, changed some settings but still we have the same problem. After calling the call center again, I was told to take the new Explora in for them to check it out. All this is done at my expense and time off from work. I did this, more settings were changed, but the problem still persists. I was then told that if it does not work I must bring both decoders for them to test. I just wonder how many phone calls and trips I am still going to make to solve the problem? In the meantime I am paying subscription for services I am not able to use. I wpoukld like DSTV to send someone out to solve the problem or take their decoder and credit my account.