Poor Service/lack of service case no.***

Cell C has changed contract pricing and decided to do their own thing with my contract. Mandla was supposedly sorting it out and advised he will call me back in 10 minutes that was about a month ago after which i received a bill for almost twice my standard bill but still no response from Cell C or Mandla. i have left messages with Pume and Nomthandizo thus far. we are now reaching a new billing but still to response from Cell C.