How to claim land purchased twice fraudulently by land mafia

My father purchased a land of 1 acre 90 d in 1981 to 1985 with 9 number of sale deeds. He had also win a TS in 1992 from Odisha high court which directed my father as 17/18th owner of the said property and subsequently purchased the rest 1/18th of the land in 1992 to make the sole owner of the property. In 2009 a land mafia took POA for the same land and purchased 2nd time with few sale deed from their children and cunningly inserted his wife name in settlement ROR. We have not received any notice to that from Asst settlement officer. Then he sole this land to many parties mentioning falsely that he has an agreement with us and is owner of 1/2 of the said property. When we went to create a boundary , he made a 144 against us and the case dropped mentioning that the sale deed of 1st party is 2nd purchase. The matter is with board of revenue to analyze to omit his name when we had received A1.90 d yadast and parcha in our name.Please help what should we do ?