******* Contract

I have been trying to cancel a Vodacom contract for 6 years, I thought it was done just to find that I have been charged for a data bundle on this contact for 6 years! I contacted Vodacom to cancel this contract, but was told that the "contract" does not have a start or end date and for this reason I cannot cancel the contract! This means this "contract" is not legal in terms of the law! I am at a loss, I am still being charged for a data bundle and I cannot get this canceled. I want this contract canceled immediately and I want a refund of the monies taken from my account for an ******* contract for the past 6 years! Someone from Vodacom phoned me about this, but was not interested in anything I had to say, their staff are clearly unfami**** with the law!