Not being helped by Vodacom

I am still struggling to cancel my Vodacom contract. After going through the whole process tell the consultant that I want to cancel the my contract. I was called by a Vodacom consultant asking if wanted to upgrade my contract because its due for an upgrade. Then I said I already cancelled my contract .The consultant no there's an error on the system and that's how I found out that I'm on a month to month contract. I just wanted to be rid of Vodacom. The consultants in the store says they don't do cancelations in the store. Its convenient for Vodacom but not for us as customers.