WORST SERVICE EVER

I changed my banking details in the beginning of september 2015,and went to the store in rustenburg to update my details. On the 15th September I called the customer service department to check if it had been update,but it was not I then asked the lady to assist me,which she said she did update it. On the 25th I saw the debit order went off my old account. I have been struggling to get my banking details change till last week friday. When I spoke to KHULE at the ceo's offices who promised me the details will be change and they will credit me for one month due to the inconveniance fo this matter. This morning I see that cell c decided to take a double debit off my account and also debited my old account as well. I called khule this morning to find out what the story is and after I requested the one month debit to be refunded he told me \is this what you do to all your accounts when you dont want to pay them"*** is this the way cell c allows their staff to speak to customers after I have been struggling for more then a month to get the account details changed? And when I want to escalate the matter and spoke to Mandla he keeps promising Lucky or Pam the supervisers will call me????"""