Pathetic service and unresolved bill issues

During the past 3 months MTN provided pathetic customer service. Being with MTN for yrs, I never once had an issue, suddenly I get a bill in Oct not reflecting my payment as done on the 2nd of Oct 2015. I queried this and made them aware that my statement is reflecting incorrect amounts. After dealing with useless late email replies not addressing the issue I decided to call MTN instead to address this issue. They took note of it, observed it on the invoices, yet haven't fixed it on my statements. Also, I suddenly received a ridiculously high bill in Nov stating that my primary nr is charged ?R700 for data usage. I found this impossible since I am certain that we haven't used any additional data during Oct and therefore requested an itemised bill. Twice I have been told MTN will provide one within 48hrs. It has been 2 weeks, no response yet and still not convinced that this bill is correct. We went to MTN at Vaal Mall to take this up further and prompt them for assistance. The consultants there were non-caring and snobbish and were not willing to help us resolve this issue. We therefore decided to revert the debit order this month until this is resolved. Please assist.