After completion of Agreement of sale.

Hi, I am selling my land which is 267 gq yards. clear title. A plot of Ex Indian navy Family. we had a sale of agreement for 90 days. According to the sale of agreement the vendee should pay to me the complete amount after 90 days and do the registration. Earlier we were not ready for 90 days however the vendee convinced me that don't worry I will do the registration on the 80th day and I am purchasing the land for myself. After the completion of Agreement of sale days On the 94th day he turns up and says I am trying to sell the land, trying to get parties to sell the land not getting the rate which I want. we told him there was no deal among us that you will sell the land for us. I am least interested whether you plan to sell the land or keep it. you paid us 1/4th money the time frame has completed plz pay my balance amount and get the registration done. Now this vendee has also put the board on my land with his name without Registration done and in the area also he has said to every body that he is about to buy our land. Today its 120 day he says I am not having money trying to get the parties to sell the land then only I can give you money. We never had a deal among us that he will sell the land get the parties and then give our money. It was a clear seller and buyer agreement done and now he is giving me a round around. Abhi nahi ja raha plot ko who rate nahi mil raha all this stupid stories. Plz help us we are in a fix. plz let us know what we can do and what needs to be done now and next.