DATA BILL iPhone6

My complaint is against MTN for billing me for data over and above my standard contract and not being able to show/validate the data.<br> I have been with MTN for over 7 years and my account has never been anywhere near the figures of the last two months!<br> June 2015 ~ R7 109.25<br> July 2015 ~ R12 686.50<br> When I went into the Gatemax store on the 7 August 2015 (Ticket 2108) to query my R7 109.25 bill they informed me that that wasn't the only exhorbitant bill I was going to be faced with and that the July bill is R12 686.50! I immediately requested that they pull the data reports to see why this was happening. The staff at the Gatemax store were trying to blame the bill on my iPhone 6, saying that it's a HD phone and it would consume a lot of data. This made no sense cause I've had the phone since February 2015 and an iPhone 5 before that, so surely it would have happened before not only in the last two months?!<br> MTN have cut my cellphone off but still no one has called me ever to discuss this issue!? I have lodged this with ICASA but have had no response from them too...