No refund and no response

I called in last week with a complaint related to the double charge of my data bundle on both of my mtn contracts. I was promised a refund which as of now has not happened. On the same day,I received my current months Bill where it showed that the same thing was again going to take place. I sent the complaint via mtn's apparently fantastic online support service...days later,still no response. Besides the fact that it takes an hour to get through to them,there service is **********. I can't wait to get out of my contract. Their HSDPA and 3G service is atrocious and I have had plenty of complaints that calls are not connecting and when they do,the line quality is pathetiC and the call terminates in any event. I'd like some response to my many complaints about a carrier who maintains that their service is amazing.