Rewardsco ******** customers

I have sent the two sim cards and handset back via the mtn store within the 14day cooling off period yet they debit my account since August 2018 i was called two months ago advising it will be canceled and yet been told its pending cancelation every call back and email they follow up with me states its still pending mondo tells me mtn has to have it canceled which is not my problem as i have spoken to the rewardsco advisor who processed the contract in the first place, my hands are now tied as the contract is still active and blocking me from taking out a new contract which i need, the reason i have sent the device back was because i was miss old aswell as the manager who finalized the contract agreement with me has **** to me aswell, Kimona Pillay at mondo customer care has been following up with me regularly yet has the same response day in and day out that she's waiting on management to process this from a pending cancelation to actually canceled. If this doesn't get sorted in a week maximum i will be taking legal action.