Advance Parole

Hi guys I have a problem I went to the uscis office to request a emergency advance parole all the information was correct and I had all the paperwork I gave them my application birth certificate of me and grandmother and two letter of two different doctor that are evaluating my grandmother one is explaining that she has diabetes and that she has her hip fracture, the other one says that she has kidney failure and she need someone to take care of her after waiting for about 4 hours they call me up and told me that it wasn't approved because it's not urgent. I don't know what to do now am asking the doctor for another letter but idk what to tell him to write down or i don't understand what's more urgent then this any suggestions of what I should tell the doctor to write down to make see more urgent please help HELP PLEASE ANYONE AM SO FUSTRADE .. am going back but I need another letter that seems to be more urgent then this help please any suggestion