Vodacom - Bitterly Disappointed

I telephonically agreed to new cell phone contract which was less than my previous agreement. At the end of the month the debit order was almost R2000 more than we agreed on. I called the Vodacom customer care line, who apologized and agreed to rectify it. Thereafter, about 2 weeks later I received call again from the call centre who agreed to collect the phone and watch which was sent within 5 days. That was on the 11th of September. I still have both. I then called them again and was promised the mistake would be corrected. Still no response. I then went to a Vodacom store where I was told they could not help. I've asked for the telephone recording which apparently they cannot share. Then another debit order was deducted at a slightly reduced rate but a lot higher than was agreed. I need my phone active do cannot reverse the debit order. This experience has harmed my perception of Vodacom and caused so much frustration.