Still being billed for canceled services!

I cancelled my Fibre line with Vodacom and its been 2 months and I am still being billed and my account debited. How difficult is it to cancel a line???? Yet every time I speak to a consultant in the call centre they assure me that the contract is canceled on their end. Vodacom you have become the biggest rogues...sorry but you lost my business. I will however give credit to the call centre for following up on their side. It seems Management needs to get their act together unfortunately.