Land dispute

My father(OC) bought 14 cents of agricultural land in 2011 from a SC/ST candidate. recently we have done the survey, 7 cents of land is in the other control. we request them many times with the village elders and revenue officers to handover the land to us. and also they managed the SI so SI is not supporting to us. don't know what to do. and we have all documents(Nakul, EC, Registration, Link documents, MRO certified document ,survey report) Now they went to court that they have agreement for this 14 cents land from seller which was written in 2007, now this seller is trying to sell the land to another person, still this seller is the real owner, so we want registration from court. 1).here issue is, seller and his childrens took money from trespassers and playing this game. fact is that they really don't have agreement at that time. 2). even though my father bought the land .but in records it was written as inheritance land. how to get my full property, Police not supporting. and we dont have supporting relatives. land cost is 4 lakhs ,almost 1 lakh we invested in this issue to police, revenue officers. and we dont want to loose the property. .