Vodacom overcharged me

For almost 2 years vodacom failed to resolve my problem, they owe me almost R4000 which they refused to pay claiming that I used the the services, I have asked for proof and they failed to supply, now that I want to cancel my contract which has reached the end of the term they are transferring me from one place to the other.

Dear Vodacom I am not interested in sweet talkings of ****s, I don't have time to listen to all your nonsense, I just want to cancel my contract and run with my life. You have no interest in saving people's money, if you had you wouldn't have conned me of my hard earned money.