un authorized

I had Two cellphone contracts with cell c for the past 48 months , This year in May both of my contracts came to an end and i decided not renew them again , i went through the required cancellation process and i was told and sent the confirmation for my contract cancellation end on May. To my surprise in June my account was debited R146.00 x 2 form cell c. No 1 both of my sim cards we disconnect ,number 2 this is really a hard time for everyone financially and i reversed the debit with my bank and was charged R5 for each reversal only for them to debit me again on the 17th of July without any phone call or botheration. I tired calling cell c regarding this numerous time but to their convince i cant get through their answering machine since their answering machine can only direct me to the relevant department after i have punched in the cell phone number i need assistance on which is my old disconnected number that their system doesn't recognize.

Pleas assist in getting cell c to contact me and explain why they are taking my money without authorization.

Regards Nkosana Radebe ***