MTN nightmare

I am totally disgusted at the appalling run-around I am getting from MTN. Three months ago someone took out a cell phone contract with MTN and **********ly used our banking details. My book-keeper managed to get hold of someone from MTN by the name of Zama Ndimande who advised us to go to the police station and get an affidavit, which we did. We emailed this to Zama (ref: A ********** ) and got a reference number 1- ********** 0986 to say a ***** case had been opened. They obviously did nothing about this *****, because we have now been debited 3 months in a row. My subsequent emails to Zama remain unanswered. The latest debit was for more than R9 000. We cannot afford for this to happen again. There are no telephonic contact details on the correspondence from MTN and it is very hard to find someone to talk to. I am getting pushed from pillar to post. Today I went to my nearest branch (Pavilion) to get a manager's phone number, but when I phoned the regional manager he said he couldn't help me and gave me another number. This number is not being answered. How is it that FICA requirements were bypassed? Why should I have to waste so much of my time trying to end this nightmare? Who at MTN is responsible for this ***** and are they still working there? It is totally unacceptable.