Goons trying to grab away my plots

In 2010 I have purchased plots from A in an unapproved layout venture and since then I am in a proper position. Recently B has entered into the venture, damaged all the plots and roads claiming that it is his property. I along with 30 plot members have registered a complaint on him in police station. An F.I.R has been registered on B in 2017 , but no action has been taken on him. B says he has sold A only 3 acres of land and 69 acres of land as agpa with development , but A has sold 20 acres of plots illegally using one survey number. When we asked to show the agreement done between them, they are not showing. Now C who are having police support and political support enters into the venture, saying they have purchased plots from A and B and threatened us with dire consequences and offering a peanut price for our plots and they want us to leave the plots to them. They are managing grampanchayat secretary, vro, MRO, rdo and registered a new name for the same layout . All the Nala charges have been paid in the year 2008. When we have asked A about this nuisance, he is saying not to involve him and advising to settle it with them. We members have form a society, and filed a complaint on them to joint collector, dgp, commissioner of police, and all the departments. But no action has been taken on A B C. Recently ACP has called all our members and said not to do any work on our plots. Instead of questioning them , why we are being cornered? We are middle class people, purchased plots in 2010 for reasonable price. By the God grace , prices to our plots have been increased. Those people want to take away our plots .We don't know where to go now.. need advice..