Vodacom *****ing money from customers

On the 24th of July I phoned Vodacom to cancel my subscriptions on 2 accounts. I confirmed with the agent that everything was cancelled and I owe nothing. I then got a reference number. The end of August they deducted R 109.00 on debit order which I reversed knowing I don't owe them anything. In September they deducted R 318.00. When I phoned them they said one subscription has not been cancelled R 109 and they charged R 200 for the debit order that was reversed. The arrogance of the agent was atrocious, so much so that I put the phone down. How can this be my problem when their agents clearly did not do their jobs?