Traumatized by Telkom miss management of my account

After changing my bank account and manually making payment, Telkom have repeatly rerun the debit order even though it’s up to date against the old bank account , charging me the rejected debit order fee at the same time . I have callled then over 11 times and I keep getting the response that they can see that the account is up to date and that the issue has not been cleared from a systems perspective. Today I got an sms that warned that the account was in arrears and was handed over for collection . I called again and confirmed that it was an error and she could see all the internal mails asking whoever to clear the issue and that she had got her manager to escalate the problem . An hour ago my line was suspended . I have no idea what to do there is no decision that I can walk into to close out this problem . HELP