Standard bank home loan

I am back again with my problem which is uo to now not been solved by Standard Bank. The Standard Bank was debating a homeowners insurance knowing that I have my own insurance and their policy document states in black and white that if it happens that you are double insured you get your money back. I didn't even claim from them but they are failing to pay my 50% money back. It's been 2 years now talking about the same story. They are ignoring me. Can somebody advise me what should I do right now, because clearly they are not prepared to give my money back. Please can someone help.