07 December 2019
It requires registration. But it is executed on Rs.10/- only and not registered. so you have to file case in court against them. Then court validate it by sending the document to the Collector under I.S.Act, 1899 and then take further action.
10 December 2019
With getting registration of thae mentioned plot, you cant claim its ownership. You have no other option but to personally get the things done instead of indulging in legal issues as your position is weak on that front.