Debit order gone wrong

I have been back and forth with vodacom. each and every month the wrong amount is debited from my account and put back. This is the second time i am writing a review on hello peter to get vodacom's attention. Their call centre called me back regarding the problem that i had, they investigated the matter and told me that it was the banks' fault. I contacted my bank to find out the problem and they assured me that they do not get involved with debit orders, they only process it. I am stuck between a rock and a hard place because both companies are denying fault. At this point in time i have really had enough of vodacom. My account is in arreas and i will not pay it as it is not my fault!!!!! Maybe this time they will be able to sort it out because i am not about to go back and forth between vodacom and my bank on this matter. They have wasted enough of my time and money for me to be calling them each time.