Vodacom Not Cancelling a contract after they said its cancelled.

I Phone Vodacom to cancel my Contract which was already a year past the upgrade stage, so about a month later, the debit order goes off. I wasn't surprised as this is the type of thing I can expect with them that's why I cancelling my contract but looks like they like taking our money... Very bad service from them to lie and tell me that my contract is cancelled and then they go ahead and process a debit order...