********** monies deducted for a contract that is not for me

My husband does not have or have taken out a contract with MTN, since August they have been deducting monies from his account. We have enquired with MTN regarding this they only gave me and invoice number for the initial invoice and refuses to send me copies of the signed contract and the invoices and statements so that I can report a ***** case. they told me that this is an internal matter as the contract is not in my name, yet they do not contact the owner of that number to correct the banking details and they keep on deducting the money from my account. i am unable to stop the debit order at my bank and they refuse to assist me further. I have been struggling with this since the beginning of September after the first debit order has been deducted. This was apparently sent to their management and to the ***** department and still no feedback. It is the worst service ever. and Pathetic that no one even bothers to come back to me. I have even contacted the management to no avail