Land dispute

Hi, I recently bought a 1 acre of land from person x 2 yrs ago and person x bought land from person Y 3 years before. Person X didn’t gave full money to person Y and informed will give remaining money once he sold the land and person Y land was transferred to person X. Person X sold land to us and we don’t know this problem as we thought everything is good based on docs. Now person Y family is trobling us on land And person x is saying I will not give money what person Y asked for. Person Y’s brother is saying this land is sold without his concern but his name was not on land. What we found is person Y sold land as he got his share and his brother share was not given by person X as there is no proof on his brother name. 1. Person Y filed a police complaint on person X saying he has to give money, and they have proof of documentation on bond paper claiming he has to give money. Person X is saying I don’t have money and can’t give it. 2. Person Y family came to land and put some stones saying this is our land and we didn’t got money. Could you please suggest on this? Shal we also file petition in police station and also get injunction order from court? We have land documents on my name, i got pahani, passbook and they don’t have any proof claiming this is their land? his name. Y