Check your bank account Vodacom deduct more monies than they should!!

Vodacom deduct R312.53 more from my bank account than I gave permission for, I call that *****ing!!! I went to Vodacom in August to ask for upgrading but I was in formed I can only upgrade my 3 contracts in the beginning of October. The beginning of October I went to upgrade and I could only upgrade the lowest 2 contracts. I query the other contract because suddenly they said its not due for a upgrade. Then I was contacted and I was informed that it was a mistake from Vodacom side and I can upgrade the other contract also, what I did. As per my knowledge and understanding is that the normal subscription fee of R306.98 and R627.48 should have been deducted at end of October and the new contract amounts at the end of November!!! My contract that was R306.98 should now be a few rand less than it was because of the data line that is cheaper than before!!! I previously had problems with Vodacom and at that point and time I wanted to cancelled my contracts after their smooth talk I continued with the contracts and at this point and time I can kick myself for staying at Vodacom!! With everything that is so expensive and everybody trying to hold up heads in deep water R312.53 deducted ********ly from my bank account is unacceptable and I realize now that Vodacom don't give a dam what their customers are going threw!!! I expect from Vodacom to credit the R312.53 on my account and stop deducting xstra monies from my bank account without my knowledge and permission!!!!