unfair contract

I am very frustrated by this huy called Brian. i called in Octeber to query my account. In September I called in order to cancel my contract and some sweet talking lady convinced me not to cancel and she gave me an offer. come end of the month i paid more that what the lady said i will pay. Then i called to query my acoount and I was informed that a team leader called brian will listen to the recording and get back to me. I have been calling back and everybody keeps telling me this brian guy will call me by the end of busines. Everytime i call i get the same message. now i have decided to reverse all my debit orders and vodacom can close their stupid line and i will buy a new phone with a new network provider. I refuse to be **********. nxa