Unauthorized Debit order on Cancelled Policy

In 2021 I took out a policy with Capitec however due to high premiums and tough financial times due to COVID-19 I then then requested for a cancellation on both policies on the (24)10/21) however only one was cancelled and the other was not cancelled and to my dismay a debit order for an amount of R541.00 went off from my account in January"22 which was higher than the agreed amount / policy fees. How is it okay that now Capitec does not want to refund me back my money when I gave enough notice to cancel this policy Unauthorized debit order which is against the law. I now want nothing to do with Capitec and I have been a client for so many years. Can I please get my refund. R541.00.