Shame on you, MTN

I have been trying to resolve an issue with MTN who late-cancelled a contract and kept deducting debit orders. Apparently, MTN owes me. I have spent several hours on the phone, sent many emails and have a bunch of useless reference numbers. Was told to email their legal department which I did (twice). Am still waiting on their promised "48-hour response". Yesterday spoke to their Client Service Dept and was promised they would ask for an urgent response. Still waiting. What can the consumer do when there is no direct contact available? Absolutely shocking.