Digital and audio problems

I live in Topeka, KS and I've been having continuous digital and audio problems with my TV reception for the last 3 months.  I have one TV and t the picture is pixilated, the screen freezes or goes blank, the audio goes off, and it is almost impossible to watch a show. The service people have been out and replaced all the wiring in the house and out to the box, replaced the digital receiver, and checked everything and nothing works. I've even called a few times and had them reboot the receiver box and that didn't help either. I'm paying a *** of a lot of money for a very inferior product. If they can't get it figured out soon, I'm canceling my service.