Policy cancellation

I recently purchased a house via FNB, and as part of purchasing the house ooba insurance contacted me to offer the service. To my understanding Ooba insurance was the house insurance cover I had agreed to with FNB housing finance, And as such the insurance would be debited together with the bond. However a week ago I learned this was not the case, And have since asked Hollard to cancel my debit immediately to which they didn't stating that they were waiting for a letter from FNB bank. I have since asked to be refunded by Hollard but they are refusing. Now I strongly feel that its not fair when they sold me the product they came across as though it was the same cover as that offered by FNB bank. I feel ooba didn't give enough information to know what was happening. I have been left frustrated by this experience by such a respectful insurance company as Hollard, all I want is to be refunded for the 6 months I've paid starting Jan 31 2015 to date. To make matters worse the bond is not even addressed properly meaning it might not even be covering the right property I bought. The policy is addressed to my previous addressed, so to say I was still covered I wouldn't know either