Dealer is not ready to give possesion, full amount paid. .. plz h

I have an agreement to purchase a plot of 198 square yards in Ballabgarh in 05/08/2013 at the rate at 5300*198 = 1049400. Initially I paid to property dealer 500000 and made an agreement on the 10rs stamp paper. I have that agreement with me. I made full payment on 13/03/2014. Now I have paid full payment 1049400 to the property dealer and made a registered court agreement on stamp 50rs stamp paper. After paying all the amount the dealer is not ready to give me possesion. He told me if registry is open then you can get registry but there is some conflict in this land so you have to wait for possesion. I kept waiting since 2014 and still there is no possesion. I have paid him all the amount and have only 1 registered agreement on 50rs stamp paper. When I request him multiple times then he told me that I don’t know whether you got possession or not. When I told him for money he told me that he don’t have even a single rupee if you can wait then you can wait else you can go and make police complain there are few complain already in police station against him and if you can make there would be 1 more. He told me that he has a very good relation with the police officers and now you are free to go. You can file a case or whatever you want to do you can do. Now please tell me what my legal rights are and how I can recover my money back. I have paid him all of money and have only 1 registered agreement on rupees 50.