Cancelled Contract but still being charged

On the 4th of January i went into Telkom alberton city to cancel my contract, i received terrible service, and while talking to the lady she was busy playing games on her phone and not listening to me. This contract was ending on the 28th of February, we then confirmed on the 28th that the contract was cancelled from the store in Eastgate, and that from the 1st of March the sim would be moved to prepaid. On the 1st of March the sim received the monthly airtime and data it usually gets and was not cancelled. So today the 2nd of March i phoned to find out why this happened and was told that the last debit order will only be end of March and that anything we use from the airtime given would be charged as well. We were told when cancelling the contract that the last debit order would be end of February. And that the contract was only cancelled on the 2nd of February, which is a month after we physically went in to cancel the contract. Someone needs to phone me and sort this out.