cancelled service not cancelled

On 2 June 2015 I cancelled a recurring data bundle from my account. On 12 June 2015 i cancelled the contract and i was put on prepaid. Today, 1 July 2015, i confirmed with Vodacom that everything was cancelled. When i looked at my bank statement, i noticed that Vodacom still deducted an amount of R307.99 from my account. When i looked at the detail, i notice that THE DATABUNDLE WAS NOT CANCELLED!!!! Also, it is impossible that i can pay R307.99 for 500meg data. I'm being transferred from one department to another, apparently, nobody at Vodadom has an idea what i am paying for. In fact, i was told that there is NO WAY i can have a recurring data bundle on a prepaid phone. I want to know what i am paying for if the contract was cancelled!