Mtn pathetic

I paid my contract but they kept taking money. I phoned them and cancelled the contract. 5 minths later im being hounded by lawyers. I phoned them again and spoke to Olga who confirmed that the contract had been cancelled but was incorrectly handed over. She credited the account and promised to email the lawyers. 2 months later and im still being hounded by the same lawyers. Ive repeatedly told them the situation. You cant phone mtn if you dont have an mtn simcard. This is rediculous!! I will never buy an mtn product again