LIC HFL not giving Documents After repay

Hello all, This is Radhika Shah daughter of Mr. Vatsal Ambalal Patel. My father has taken loan for our home with LIC HFL With two loan account as there are two flat combine one house. My father has passed away on 6th October 2018 . So I have repaid for remaining loan amount for both the account . I have received original documents of my one file only on 29/11/2018. But I have not received my another original documents. As it was not there in Ahmedabad office. As per staff here file supposed to be in Mumbai office and it will take 15 working days for file to come to ahmedabad’s office. But it has been more then “TWO MONTHS” and I still did not have received my file. Lic Hfl personal including area manager is not giving accurate answers for our documents. One he is saying your file is at HO Mumbai that will come ahmedabad with in 15 days and some time he has not clue where our file is? Mumbai HO branch have confirme them telephonicaly that file is not there as per manager. Though they are not providing me duplicate documents. One main reason for emergency for documents is one buyer is ready to buy our house.I am the only child of my parents. What should i do in this?