Land encroachment

One of our relative has a small open land at their native (Kerala) which was allotted to them at the time of property distribution. The family is settled in Mumbai. After partition within 3 months’ time the nearby temple committee members had approached the family to give away 1% of the land to the temple as a donation which was turned down by the family. Recently they are facing with lot of issues, no idea who is behind the foul play. 1) The Local Panchayat has put an objection in building the boundary line for the property. 2) Some unknown person has lodged a written complaint stating the family has taken more area then the allotted land. 3) Even some political party is also backing up in this tussle. 4) Thrice the AEO committed to be at the site for checking and finalizing the issue, but in all the three occasions they defaulted and now they are saying to need to do a resurvey The complaint says the land belongs to PWD. Does village panchayat have a say in it?. Should village panchayat give us a notice or should we get a notice from PWD. We haven't got a notice as yet? is a notice mandatory Based on a complaint received how soon should an action or a notice be provided to the land owner The village panchayat says it may take 6 months to do a Re survey. Does it really take that long? Is it alright to leave the plot as is or should we pursue to create a wall there In lieu of us not getting a notice can we pursue to build a wall