UNRESOLVED DATA COST

I noticed the invoice amount on my cell phone account escalate drasctically, despite normal usual activity ie, cell phone calls, messages on BBM and Whatsapp,use of the UBER and gautrain app.<br> i called the contact centre on 1 Dec 2015 to report the unusually high billing and increase in the data usage. An agent by the name of Bev took the call (call ref 592 893 2) and i was advised that MTN would get back to me after investigating. I requested an enquiry into the unusual data usage and also asked for the rates at which the data is charged at currently in comparison the rates charged between Sept and Oct 2015.<br> I am yet to receive any feedback, however the new invoice for December has arrived with the same very high data cost and usuage.