Contract expired, but still paying for it?

I gave VMSA notice to NOT renew my contract after its 2 years have lapsed. It was supposed to be cancelled on 17/10/2015. On 11/11/2015 I phoned to confirm this, since I received an invoice. I was told by Mpho Molotsane that there was a problem, my contact has not been cancelled as it should have been, but that she would cancel it with immediate effect, and that she'll credit the invoice. (Reference Number for that call is ***9).<br> <br> This morning yet another deduction has been made - which leads me to believe that the phone has still not been cancelled? Apart from changing my bank details so that VMSA may stop deducting installments, ********ly, how can I get rid of this contract, and do you refund the money you deducted back into my account you took it from or do I go collect it at my nearest branch?