Land Issue

My father bought a piece of land in Noida Sector - 143in 2013. Recently when we went to check on the land - first our boundary wall was gone and second someone else had put a wall in mid of the property (out of 200sqft, had put a wall on 100 sqft). We called that person and said it's our land showed him the papers to this he said his dealer has provided him this land and he won't move out. We checked his papers too and it says his piece of land number is something else. According to the map we are correct but he says this map is only for reference and created by Dealers only, so numbers doesn't stand valid. Our dealers are of same family, both are running from police so doesn't want to come infront. We approached Police Station and filed a complaint against him and then tried to sort out the things through other dealers as well. But nothing concert came out, a month passed like this travelling to Police station and Dealers. In frustration, one day my father called the Bulldozer and dozed-off his walls, the other guy called the police.Police sent both of them to jail for disrupting the law and order. After coming out, my father talked with the other Dealers of that area and changed the direction (to East-West) of the plot and got it documented (previously the rectangular land was in North-South direction). This way we left somewhat 100sqft. That person is still not letting us to construct wall on our land says unless and until he doesn't get his preferred land he won't let any construction happen around his land, every now and then he dials 100 and calls up the police and says it his land. Now Police says go to Thana and get it resolved. But the SHO says, get me a written from lekhpal then only she can help. We also went to SDM office asked for help he wrote on the application " SHO - Please maintain law and order". What can be Done in this case. We need our land back, though the person doesn't have the right papers he is not letting us to build the wall. Don't want to go jail once again.