DEDUCTING MONEY FROM MY ACCOUNT!

I have ported from MTN to Vodacom in the beginning of May, 2015. No problems with the porting. The last payment should have been the beginning of June. However, money is STILL being deducted from my Bank account every month, as if I still have an account with MTN. I have been to the MTN branch in Somerset Mall and in Waterstone in Somerset West. The service there was friendly and on all the occasions, the person helping me confirmed that the last payment should have been the one in June. They have emailed the finance office several times to correct this mistake, but to no avail. The amount subtracted every month is also changed at random and although I am putting a stop order in at my bank, the reference number is changed by MTN, allowing any amount to be subtracted!<br> <br> MTN management, please help!