Debit with no contract in place

Called in September to cancel my contract which expires in October, I have been dealing with 4 different consultants during time (as well as a do called manager) and still the problem has not been solved. My account is still being debited but I have no contract with you. What does it take for Cell C to sort this mess. I'm frustrated as a client, I've been with you for over 10 years and this is the service and response I recieve.