Unhelpful and difficult with claims

I have the highest gap cover with zest life. I am having issues with them as I have sent all the documents that they request, yet they still keep sending me an email saying documents are outstanding. When I called them they are giving me long stories and not even assisting me. I have sent you every document you require zestlife, the hospital account, invoices, medical aid statement and the doctors accounts, please explain to me why you are so difficult. I changed my plan to the most expensive so that you can stop giving me issues, but clearly you are still being difficult and very unhelpful!!! Please assist me in getting the documents that are supposedly outstanding because I have called Discovery and the hospital multiple times and have sent you all that they have sent me, but you seem to think there is still stuff outstanding!!!