Bought disputed land

Hi there!! Unfortunately!! I got to know all this late but now as time passes it has become important for me to take stand and understand what to do next...and this has landed me here. I bought a plot from one of my uncle who is not in blood relation. Post buying the plot he gave us the document as below : 1) Notarised stamp paper with mentioned as my mother being new owner of that piece of land. Possession letter on same notarised stamp paper. This document also shows the boundaries of plot. 2) A piece of hand drawn map. He falsly said in starting that he'll soon get registry done of plot but now we got to know that his nephew has lodged a case against him on same land of which our plot is a piece of. Today, after constructing a building there and when I go to electricity office I am not able to get meter at my buliding as I do not have proper documentation as per authority. Since plot is in village area panchyat people officials because of this dispute are no giving us required documents for electricity etc. I really really need to know on what to do now as I am blocked and locked very badly as I am not sure how to approach from here. Please advice!! Note: I am not the only one who is suffering with having no proper documentation. We have complete colony being like this there.