MTN: Charging for data already paid for!

I have a 2gb data bundle which I've had since initiation of my contract. From July, I don't seem to be getting that databundle and despite using less than 2gb I keep getting charged for data use. As a result I get these exhorbitant bills and no data. MTN is *****ing my data and my money!<br> I've logged numerous calls with the call centre who keep promising me that someone will call me back and never do. I've been to the branch and they logged a call and got feedback that it was resolved but it wasn't. So they told me to call the call centre who then hung up on me when I was explaining my problem.<br> It was only when I ended up in tears and in frustration that they again tried to help me.<br> So now I'm in a position where MTN have acknowledged that they are not giving me my data bundle as per our agreed contract so they want to refund me the cost of the data bundle rather than the cost of the data charged which is ********* and unfair. MTN need to refund me the cost of the data that I was charged because their systems did not credit my account with the data that they should have. I paid for the data bundle and I want that - I also want this sorted out.<br> MTN are *****ing my money and data!!!