What to do supplementary agreement not registered

Hi Sir, Recently I bought flat in Bangalore, it is land owner's share, and the land was owned by 4 owners. But as mentioned in supplementary agreement which is not registered, the only one land owner came for registration and registered on my name. But The bank people, while issuing Loan DD they found above problem and DD not handover to land owner. And they said all land owners should sign in my registration document of my flat. Now Bank people telling that they are ok if They give release deed from land owner with other 3 land owners. Please suggest best option .