Cannot get information about my disputed account

I have tried on several occasions to speak to the appropriate level of management or get an email address for direct correspondence with a senior (enough) manager. I have left many messages \on the system"but keep bumping up on the corporate glass ceiling to have the right attention paid to my complaint. I have been charged ~R10000 for international data roaming. I was on a 4-day trip in Angola and did use international roaming very judiciously and wifi otherwise. I was warned by SMS that data usage would be charged at R102.50/mb and I have been charged with around 1 gig of usage. I know this is impossible. After contacting Vodacom about this (call center) I received an SMS from Vodacom customer care agent Mogammad Adeeb Davies saying that the information he has shows that all the data was used by my device and sim card - I have not had access to this information as I cannot locate this person nor anyone else who can help me. I dispute this information anyway. He also indicated in the SMS that he would \""try and arrange a discount\"" for me from teh data division. Repeated calls to various call centers (one referring me to the other) yield no results. I have ~10 reference numbers."""