Again multichoice tried to debit more than the amount that they should from my bank account

I am really fed up with being over charged on a monthly basis. Every month MULTICHOICE charge me for a PREMIUM SUBSCRIPTION X2 while I am on the R949 price lock plan. And THEY try to deduct the incorrect amount MONTHLY which is double every month from my account by debit order. I contacted the pmtplan accounts department last month already to rectify these double charges and to do a reconciliation on my account which they did and they promised me that it wont happen again. But they continue to do it. Id ********** 237084