Refund my money

I have an investment policy with old mutual for a year. I went and surrendered the policy and requested for the policy to be closed. I sent emails to customer care following up just to confirm that this was done. I was advised that the policy is still on books. I requested that it be closed as I no longer want to have money debited from my account. They debited an amount of R550 over the weekend. Needless to say I want my money back. I want that debit returned. How can they hound you and call you countless times to take up a policy with them but, in order to access your money its a mission and a half. Refund my money.