PAYING TRIPLE

I was recently debited over R1700 for my cellphone account, where as the agreed upon amount should have been under R800. When enquiring about this - having gone through customer services, accounts department and finally data services - no one was able to adequately answer me as to why the amount was so high, nor which dates this was applicable for, other than simply, \it is for additional data used...". Baring in mind that I have taken out a contract for 1.3GB of data. Not even the staff in-store could answer me. To add"