Pathetic vodacom services

Vodacom deducting monies for data every month. Phoned and ask that they cancel it and they told me that it won't be possible as i am on a fixed contract... I told them contract has expired long before and that a guy phoned to give me more data for few bucks more. I told them that i don't use the data and when i do it is usually finished. The lady told me only the guy that phoned me can cancel this. She told me she will ask him to make contact with me. After a mounth still nothing i phoned again and tried to cancel it again. The lady told me i need to speak to the contract department. I asked she must have a look where all my data is going before putting me to the contracts department after which she looked and told me that vodacom never gave me the data for the monies deducted from my account. Why should i pay for something that i mayby not eveb received??? After putting me through to the cancelation department the asked me security questions and confirmed that they have my profile infront of them (all my personal details including my number) then suddenly they have dropped the call in my ear.... Never phoned me back... Why should i phone again??? They can phone me... They have my profile infront of them with my number... So i decided to cancel the debit order cause i did not get what i paid for!!! Please stop my contract and sending me your invoices... I broke your data sim... Dont want anything to do with your pathetic service!! Thank you. Hannes Steinmann