United Healthcare--BOOOO!!! Need suggstions

United Healthcare would not approve me for surgery..they said it was not "under my husbands plan" for his work at all. They gave conflicting information to my WL clinic and told them it was not an exception and I ended up wasting almost 2 months on trying to get approval but they ended up just coming back and telling me its not covered. I am really bummed since I know so many other people who have the same insurance that it covers. they did cover my office visits but not any part of the surgery. I am going in this selfpay and my surgery is july 30th. I am looking for any suggestions that some of you might have in just being 100% sure that there is nothing I can do to get my insurance to cover any part of the surgery post or pre op. I only know what i know so hopefully you guys may know something I dont