Exorbitant bill

I received a bill from MTN last month totalling to twice my monthly bill.<br> I have tried calling 808 many times, only to select my option to speak to an operator, hold for more than 5 minutes and then have the call cut on me on numerous times. The billing amount has already been debited off my account however I refuse to believe that it is correct. <br> When corresponded with MTN via twitter, the response I received was I paid internet usage of R742.47 (2.9GB of data) for one account and for the other account R485.22 (3.3GB of data), bearing in mind that on both accounts, my spouse and I ensure that we always have prepaid data loaded as to avoid these costs. When requested for them to justify the costs of paying more for 2.9GB of data, I received no response via twitter or the promised email that was to be sent to me. <br> I keep receiving these smses also that my data is finished and I must load but when I *141# , it shows that I have data. <br> During these hard financial times, I just cant afford to receive these high bills every month esp for a service that im not using.