DSTV Unhappy Client

I have a problem with my dish every three months I get an error that says there is no signal when I call MultiChoice they will tell me to call the guys to come and check meaning am paying extra R350 last time when they were at my house they installed new LNB cable where I paid call out fee of R350 and R350 for LNB cable. Today I called again with no help am really not happy with the service am receiving from them I have been paying my subscription with no fail all these years. If they can't sort this out can they please cancel my subscription and refund me for the month that I paid