Vodacom Insurance Cancelled WHY AM I BEING DEBITED!!

I cancelled my Vodacom insurance on the 3rd of this month; however, my account was debited yesterday, the 15th. I called Vodacom insurance, and they confirmed that the cancellation was logged by me on the 3rd and processed on the 8th. They claim I should be refunded; however, I should speak to accounts for a statement. I called the accounts department and explained the situation, and they transferred me back to insurance for me to re-explain the same thing, only to be told the same thing they had said initially. They then transferred me back to accounts. This is incredibly frustrating because I'm being sent from pillar to post with no solution. The agents are oblivious to what you're saying and simply don't want to deal with you seeing as to how quick they are at transferring the call. I am incredibly frustrated to say the least.