Account MTN

Accounts MTN: TO WHOM IT MAY CONCERN. This is really just getting ridiculous. According to MTN's and ICASA correspondence the problem is resolved , but still have not been resolved. They even send me a BILL with 0 Outstanding. This month they deducted a huge from my account. As well as the money deducted from my account since July ********ly., because they do not lock the instruments received on my account. How do I go about this? How do I get my money back?. Please Advice!