Receiving payment but can't provide the service we pay for

Hi I am a long standing DSTV customer I have the full package +dual view every month we can only watch 2 or 3 channels for 3 to 6 days becuase if keep searching for signal and the rest of the month it plays all channels. Have reported this several times but they keep on saying nothing is wrong. I even spend more money by replacing all equipment and had people out to look at it they have informed me nothing to do with equipment DSTV signal problems there people working for them at customer service don't know what is going on. They just like receiving there payment buy can't provide the service that people pay for.