Continuous Debit Orders

I have been trying to cancell two policies since January, still no joy. I have logged two complaints on Hellopeter, two complaints at the branch, signed forms, but my bank account is still debited every month. How long will Old Mutual get away with debiting my account and when I am trying to close my policies, I dont manage to do that. I have been waiting for my Encashment for almost two months after closing my policies. Everytime I contact them or go to the branch, they go back onto the system to cancel the policy but I wait another month then go back and the same process begin. I have had it with Old Mutual, no one is willing to help me.