Sathekhat

Dear Sir The problem is : I am owner of 3 rooms in Pune. I am not residing there long ago.Two tenants are from long time there. Before 7to 8 years ago I hand over my vacant room to a needy person for few months. On plain paper he wrote that he will left room after some time and sign it. After that I sold this property with registered sale deed to a part. This party assure that more than half remaining amount would be given after this needy person hand over possetion to me. I request needy man to vacant room. But he refused to do so. He went to local land mafiya. after this he threatend me that he would hang himself if i ask about possetion.By fault I abuse him. He record my conversation and went to police. Police did not recored n.c. on me. But In this sudden attack I come under tension. This needy once take my bank account number when our relation were smooth. And he use to deposit money every month. After knowing his intentions I submmit a written complaint to police station. Police did' not take any action against him. I could not give vacant possetion of room to purchaser. mean while, He give false information in a incident to police on recored that he made tenant agreement. He is continue residing there by support of land mafiya. I shocked to see that needy is a black mailer. Mafiya said to me not to worry about this person. He force me to sign back dated notorised Sathekhat.(100 rs stamp paper agreement to sale) In this Document he did not mention time limit of purchase property. He also mention in document the possetion of property. (Taba sathekhat). He tranfer light meter on his name with notorized sathekhat. now he is not redy to purchase property. First purchaser saying for give there maony back. My question is that !) can this needy prove himself as tenant? 2) If I file case for possetion in court, what wlii happen? would court also find me guilty forkeeping unauthrised tenant? (without follwing agreement))3) Is this sathekhat is valied ? how much time limit is in law if there is no mention on sathekhat.? 4) what is your suggetion to solve problem. Please guide. i will be very greatfull to you.