CellC - Not canceling contracts

I have ask cell c MANY times to cancel all the contracts on my ID number. Still is it not cancel. I received emails telling me I need to pay. they steal my money every month. when will I get my money back as it is not my fault but cell c fault for not canceling everting as I asked? Cell C is the worst network provider they have no customer service and are not willing to assist. What can I do to get cell c off my name?