Vodacom ***** Charges

I upgraded a contract with Vodacom, but returned the item and cancelled the upgrade. For 2 months thereafter I was still charged with the upgrade. Several calls to Rudzani as well as emails to Shameel Joosub, eventually got that reversed, but incorrectly. They eventually got this right, but then the next month, they added some other charge. Had to call again, and after several frustrating explanations, this was reversed. I thought it was all sorted, but they then added some other charges, e.g. contract cover which I had never taken out, so once again a call, but my bill this month is still not corrected and I am charged the higher amount. I have emailed Vodacom to request details of the Ombudsman as I now feel that I am not the only one being overcharged, but the have not responded. I have emailed Shameel Joosub, the CEO, but still ignored. I would really like to know how to proceed as I have to spend hours trying to resolve a problem created by Vodacom. Who do I contact to ensure that Vodacom is audited as I am not the only one this is happening to. If the CEO feels that this is OK, what does this say about the ethics.