Wrongful Debits

I have cancelled all my policies with Old Mutual about two months ago, however every month my account is debited, last month they told me the issue was resolved and money deducted was reversed to me, I didn't even complain about bank charges - now my account was debited again on the 28th February 2018 that means more bank charges. When I call the call centre they telling me my policies are not cancelled, after I went to the branches twice to cancel the policies. I am fed up.