********** deductions

I have been paying R99 per month for airtime/bundle for I/net for some time on contract for sim card ***. 15 January 2015, my account raised to R717.99. I phoned them immediately to inform them of the issue. I got the reference number S3-8UVID-D72C3. During this conversation, I was informed that the deduction is **********, and I was assured that the correct amount of R99 will be deducted, not the R717.99. Despite the assurance, the R717.99 was deducted with month-end. On 1 February, I immediately contacted them again with my complaint. I was requested to send an affidavit stating that I did not request the additional expenses. This was sent through on 3 February. I received a new reference number ***~2ZWF. Vodacom committed to the issue solved in 2 working days. On 10 February, after 4 working days, I lodged another complaint about the account still not solved, and no refund. I received an acknowledgement that ***** was confirmed and a case of ***** opened IR0178-02-15. On 16 February, I received a bill again for R717.99, still the ********** amount. There is no progress with assistance, and Vodacom thrives on the debit order instruction.