Nationstar Mortgage Mortgage Complaint

Nationstar Mortgage Mortgage department,

Conventional adjustable mortgage (ARM) Credit decision / Underwriting Utah

My father died in 2012 and I have been paying on his mortgage under his name for the last 4 years that my fathers estate has been in probate ... ... Finally I am allowed to purchase the estate, I am financing through my credit union and they are requiring a purchase letter from Nationstar Mortgage, my loan is at the under writers and this is the last document they need from Nationstar ... ... .I submitted a request 4 days ago, I have called at least 20 times and keep getting different answers to fax numbers ... - faxed his death certificate and the simple purchase letter that my FHA loan requires - I have even faxed over my court papers stating that I have 30 days to finance the home or it will go on the market which is - - ( 2 weeks away ) ... ... .THEY ARE AVOIDING GETTING ME THE LETTER I NEED TO PURCHASE MY FATHERS HOME I HAVE BEEN FIGHTING FOR FOUR YEARS AND THOUSANDS OF DOLLARS IN LAWYER FEES. All I need is - piece of paper stating the payoff amount and Nationstars signature is that so difficult???????????