Incorrect billing

Dear sir/mam<br> <br> MTN billed me an exhorbant amount for my cellphone account on my previous statement. It's an amount of R4680.23 which I believe cannot be accounted for. There is also a limit to my contract usage which blocks anything from going over my spending limit, which is not even close to half of what they billed me for. I sincerely want them to rectify this and reimburse into my bank account everything they debited me for over and above the limit that is on my contract.<br> <br> I have logged a call with them about this around the 3rd of July already, but they have never returned my call, and neither do they ever answer my calls on the call centre. I've tried numerous times early in the morning, late at night as well as during the day, but no answer. The reference number for this call is #***8.<br> <br> Regards<br> Pieter Jooste