Cancellation of the contract

I phoned vodacom call centre towards the end of September requesting for a cancellation of my contract, the consultant I spoke to refused to cancel advising me that the contract is binding me for 24 months, however when i took the contract in june the consultant i spoke to advised me that i can cancel the contract anytime giving them a 30 days notice. So the consultant said she will retrieve the call to confirm what was discussed on the initial call and will call me back, this is already the 3rd week and i haven't heard anything from anyone. I am really asking myself what is going on with vodacom? This bad service and bad expirience is just going on from vodacom, 1st its the airtime dissapearing and now this??