MTN *****ing my money, and a manager cannot help

I upgraded my two cellphones in May 2015. Ever since then when I did a *141 check it reported that I have 0mb of data. I am supposed to be allocated 500mb on each phone. I went in to the branch and told the lady what is happening. Se reported back that it is a problem on MTN side and that I do not have to worry about it, I will never be billed for data used.<br> Well. In the Month of August I was billed R2,600 and September R3,500.<br> <br> I went into the branch again and spoke to the Manager, Alisson. She promised me that this will be resolved and that I will get my money back. I called her last week and she informed me that they are paying back R800.<br> <br> The conversation got heated and now I am not getting answers from her, she is ignoring emails and calls.<br> This lady should not be in a managerial position if she cannot resolve issues that clients have that are furious. This is what managers are there for no? Ignoring clients?<br> <br> I want this billing issue resolved on both numbers. I want my money back for both numbers.<br> I want you to look at the last payment of R3,500 because this is impossible, as I limited my data usage from August after I had to pay R2,600. Please resolve my issues.