Land dispute

The property was purchased by my grandfather and his other brothers in 1993. The dastavej done at the time shows 9 names entered as claimants. In the year after 1993, three of the members submitted all their claims to my grandfather and decided to evict the land. They ceased to claim any of part of the property. Subsequently their names were removed. In 2000; three of remaining six, decided to construct houses on it. And hence they have asked to give their share from the 'vada land'. My grandfather prepared their plot size and did dastavej for transfer of property. After doing new dastavej, and transferring their share they have denied to submit their claims on remaining plot. The land even after giving their share, remains on the name of all six. My grandfather is still paying revenue of all the land and all demands of him to give him share In revenue paid by him was denied by three claimants. The land is Panchayat vada land. And my grandfather is paying all revenues. (For whole of the plot and not the remaining one). How can I proceed to remove their claims and get the revenue amount back from them which is paid by my grandfather?