No Action as Requested

I contacted Telkom Mobile call center in June to change my banking details. They continued to debit the incorrect account so I went in store (70km away) and changed it with a consultant there. They still continued to debit the incorrect account. I called the call center again and changed my bank details again. They are still debiting the incorrect account! It has cost me so much in bank fees due to the retuned debit orders each month! Not acceptable!