Bad service

The decoder always speaks of signal errors but what puzzles me is that the signal is bad for the channels that one watches and the one I don't watch plays fine. Why is that and when you call you get people like Dimakatso who will just hang up on you after you explained your challenge. She obviously has no idea why she is there. I am thankful that when I called back after Dimakatso I spoke to Thembeka which she tried to help me though she could not holistically help because I ran out airtime. But it's evident that client service is not invested on by multichoice or Thembeka would have called me back.