Telkom's bad voice-connectivity and internet service

We recently ported from MTN to Telkom Mobile as Telkom Mobile were offering fantastic rate/deals on their contracts. We had been with MTN for many years but decided to port as MTN had become very expensive. This , sadly was a grave error as the connectivity (call and internet) is, to put it mildly "SHODDY" !! Numerous calls to their call-centre have also left us with no answers! Since then, we have heard of many people having had similar experiences and some actually "ran their contracts out" , but went to other service-providers!!! Is there any recourse ? - based on "bad-service-delivery"??