Breach of contract

I have a data contract that I have with Vodacom that has a limit set on it when it gets to the limit it will not allow me to go over the limit now I have been over charged R2500 in the last two months which according to the contract I have is not possible. Therefore I demand the money be paid back immediately and the contract terminated immediately or I will take this matter to the CPA and if needed take legal action as Vodacom has clearly breached the contract as such I am well within my right to demand my money back and that the contract be terminated with immediate effect as per the consumer protection act . Further more I have never received any form of invoice for this contract or received and notification of my going over the limit which is again a breach of contract. I have spent 4 hours with no success trying to get hold of someone in customer care today this is why I am complaining about my problem here because Vodacom simply have no customer care whatsoever. Please do not bother phoning me as I have no desire to waste time talking to someone who is going to try and justify your mistake I want my money paid back it is as simple as that nothing else will be acceptable