Unfairly listed

The worst decision ever , I recently took a contract with MTN and gave them account details and authority to debit 5 months down the line they have listed me , how why wasn't I advised of not getting premiums or the least tell me of their intentions, went back to my back statement and they have never attempted to debit , called to confirm the account no the last 4 digits are correct what happened I don't know? Was supposed to sign my new employment offer but guess what I have MTN dark cloud hanging over me . The legal department has been going to call is been a week now and u can't call them as they can only make outgoing calls I am really fed up with this whole thing and the attorneys are not doing this better as they continue calling as well. I am really not sure of what to do now