Vodacom Fibre Cancellation

I cancelled my fibre contract with Vodacom in July (all forms submitted and they acknowledged receipt) and they are still to this pulling debit orders from my account to this day. I've sent multiple emails (which have been ignored) and made multiple calls (of which they keep saying they will contact the responsible person). This is full on ******** and not the first time I have heard of them pulling this stunt.