have been *****ulent debiting more money on my account

the call centre is the most useless call centre i have ever spoke to. It has been two months now since I noticed this company has been double debiting from my account. I cancelled one of the car that is no longer in my position last year November and since then they have been *****ulent debiting for this car from my account when and logged this again. They have been trying to debit more than 165 sometimes R700 or R500 though they apologised still they don't want to refund me but instead they are debiting more so I told myself I will just reverse these amounts and I requested to be called by their manager and no one calls instead they just go to my account for more money