One property with two registrations what to do.

my father bought residential building on 19/12/15 from ABC who was in debt and since he couldn’t pay the dept,the building was a debt recovery asset of bank. A bank recovery agent told ABC that his house will not be auctioned if he pays the debt through him. So my father gave the money to the recovery agent and ABC and all of the paper work(including the original papers of the building and the original) was done . but on 2/01/2016 my father was informed that the bank has auctioned the building to XYZ in Aug-2015. but the key points here are- • the registry of the the building by XYZ was done on 31/12/2015 where as the registry by my father was done on 19/12/2015. • the bank didn’t placed any notice at the building prior to auctioning and neither after the auctioning. • the original papers of the building are with my father. • whereas XYZ has filed a complaint of lost of the original papers on 05/01/2016 that the papers were lost on 04/01/2016 .