Ptcl act

Hello, i am just a common man who has become victim of PTCL act. I have ended up buying a site in a layout formed out of granted land in Bangalore. The developer purchased the and from descendants of grantee, formed layout, and sold plots to many people. Now, some purchasers say the land is SC/ST land and are scared to construct. Is there a possibility that the grantee can reclaim the land at anytime? Reclaiming land after selling for good sum is plain cheating in name of PTCL act. If all buyers get together, can we fight a legal case and win?