Unexplained Data Costs/Very Poor customer service

I initially had a 2GIG Data contract with Nashua mobile which was R99 per month, I never paid more than R99 per month (And was softlocked if I exceeded 2G). Since MTN took over the account it has been nothing but a problem, first the account went up to R222, then R299 (I requested a limit to be set). In august I got a bill of R1318??? The service is absolutely shocking, you cannot get through to the Call Centre and the email responses do not answer my questions. Firstly I was told that I had accessed the MTN menu & downloaded ringtones which is not possible with an iPad. I went into the branch the consultant could see that my data usage was consistent but in August it went sky high, he also agreed that it was not possible (***) - still waiting for a response from MTN. The one person (Thando Mgobhozi) indicated that there were tariff increases on all packages, how is that allowed if I signed for R99??Nevertheless, I received my account for September & once again it's R401 (I had also set a limit again in September). MTN is the 1st to deduct each month, but has POOR customer service. Sadly, I'm not the only one having this problem judging by all the complaints I see.