After cancelling my insurance, billing continues

I got a better premium at another insurance company so I phoned Auto and General to cancel my insurance with them. They said that there won't be any debit orders anymore because the last day of insurance is the 25th of October 2015. And on that day, they debited my account again with the premium. I had to go through all the trouble to reverse it at the bank and it cost me R 40 for their mistake. <br> <br> This is really disappointing!