Billing Problems

I am very disappointed at the way altech autopage is doing things,<br> <br> I took a laptop contract that was going for R199 per month and free 500M. From August 2014- Dec 2014 I was paying R214.00 on average. All of a sudden I was invoiced R5700, when I sent an email requesting explanation no one bothered to respond but they were quick to debit my account. Again for Feb I received an invoice for R5800...I spoke to a consultant and they tell me I used the 3g but the times just do not make sense. I asked if does it make sense that I jump from R214 a month to R5800(61G) of data? They can not answer that question...<br> <br> Can some one please do something with this billing situation, otherwise we are getting our lawyers involved because it is not possible to have such a drastic change in usage!