Debit Order Query

I just called MTN to query a debit order that went off my account and meanwhile I do not have an account with MTN. I have called my bank and was advised to call MTN to ask them to stop processing any more debit orders. I have called MTN and they cannot assist me as I do not have an account with them.

A consultant asked me to email and they will escalate the query, I sent an email and it bounces back, i then call again and am told they will put me thru to contracts department and will be assisted there. I am now being given the run around that I must go in-store to get this rectified.... Can someone tell me which store I must go too.... For crying out loud I do not have an account with MTN.

All i want is the debit order to be cancelled, will someone just fix this issue.....