Can i file a defamation case on person who filed false case against me accusing me of land grabbing?

We have an industrial land in a town its in 2 parts part1:one acer and part2: 2900 sq.yards brought from same person(X) in 1970's now the grandsons of that person X one day showed up on the site and forcefully started erecting temporary structures on the land they claim that their grandfather only sold us part1 (1acer) land and did not sell part2 land i.e (2900sq.y) they have filed a case with the police that we are illegally occupying the 2900 sq.y of their land and we should be vacated.We have all proofs of ownership of land with all original document record of 50years of both part1 and part2 lands. We filed a complaint on those individuals on basis of trespassing and forceful occupation of our private land.those descendants of the personX don't have any single proof that the land is still theirs. they have invited the media people and given false statements on us about grabbing their land.Can we file a defamation case on those individuals since they have falsely accused us of land grab without proof and illegally erecting temporary huts on our private land and creating nuisance and trying to paint us wrongly in the society ?