my grand father sale an agriculture land in vrindavan mathura to delhi's party by post dated cheques in august 2008. time of post dated cheques is till sep 2009. but after some initial cheques the all cheques has bounced. the all cheques are open in registry documents. then the land also transferred other's party name. what can i do now. the land aquirement has not proceed till yet. can builder aquire this land by force of police. after 2 year can i cancel the registry and land nomination back to my grand father. plz suggest us.