Cancelled policy but money was still deducted.

After 9 Years of being with Miway and 8 of those years being claim free, I sold the vehicle covered and cancelled the insurance policy on 28-11-2019. I received an official cancellation letter on the same day. The senior call center agent informed me that I will be refunded for the remainding days of November and will not be charged further. However, come 30-11-2019 Miway deducts R605.62, the premium for the cancelled policy from my account. According to the contract, the debit order is taken in advance for the next month, in this case December. So now I have paid for insurance on a vehicle I do not own and for a policy I have cancelled and could not possibly use.

Is this how Miway rewards a good client by *****ing my money?