Vodacom ********** activities in my account

Vodacom is now issuing contracts that doesn't even exist to deduct money from our accounts? on the 10th of August i was debited R269.12 and i reversed it, 31st i was debited R370 and i reversed again, and now I'm debited R997.99 and i called them and i was told i have a contract with number ***. i asked where did they deliver the contract to and they don't wanna tell me. now i have to follow them and find info which they refuse to give me.