Incorrect debit

Over 2 months ago i requested a copy of my cellphone contract. i have not received anything from MTN and i am not getting assistance <br> The call centre keep on referring me back to the store, the store gave told me that they are just a franchise to MTN, i am not interested in that. They instead gave me the regional manager's details and he also still not been able to provide me with this document. <br> If the copy of my legal binding document is missing then how is MTN billing me? i am getting debited different amounts every month and the call centre agents also cant explain this to me. <br> <br> not only that, they have no knowledge what the NCA says, they have bad attitudes and cannot be patient enough to explain to client's hat is going on. <br> <br> i spoke to another call centre manager who promised to call me back but hasn't done so, no-one knows who and where this manager is based.