My property road was blocked by neighbour whose land is still as a agricultural land.

My property road was blocked by neighbour whose land is still as a agricultural land. We 6 people has purchased 40 cents land together and splitted them into 6 cents each with leaving some place for road and done the registration in 2003 in Vijayawada, AndhraPradesh. But my neighbour is also having 50 cents land which is still as agricultural land. But surrounding to that land, all other lands been constructed 3 stair buildings. So my neighbour is saying that he bought 9 cents land from his neighbour for giving the road to him. So he is demanding 9 cents land from our land (1.5 cent from each person) or 90 lakhs money (15 lakhs from each person). He is blackmailing that he will register 5 cents of his land to his brother as agricultural land (since his 50 cents are ) and the remaining 45 cents he will use to construct for a building. So that he can build a fencing or a wall to block our road. Could you please suggest us how we can deal with this. Is it possible to block the road for us by keeping a small part of land into agricultural land which will blocks our road? Can our problem solved using courts, without compensating him?