Worst ever experience to cancel a contract....

Never take out a contract with Vodacom, i have cancelled my one contract and paid my early cancellation fee, send it via 56 email, and still had to phone like 15 times. This month the contract is now on pre-paid and i am still paying for it, plus an additional R500. and now been told that i pay for March cover and another the R500 is for cancellation of the contract. What is the early cancellation fee then for? How can i pay for an account that i have cancelled on the 5th? The call center is the worst place to deal with ever.