Land encroachment dispute in Trivandrum, Kerala

I bought a plot in Trivandrum in 2006 with my(and my dad's) hard earned savings. The land adjacent to and behind my plot are agriculture type of land(banana plants and coconut trees and all). On one side there is a small house. I left to abroad for a job assignment in 2008 and after a year or so some people with the help of a local small time politician (who own land and plots behind and adjacent to mine) approached my father and asked to give two cents of land to them from the side of my plot so they can build a road along the side which would increase the price of their land. But they wouldn't pay us the then market value of the land instead they said they could pay the rate that I paid years ago when I bought, which was atleast 4 times less. We said we could give the 2 cents either at the current value or they give that much land at the back of the plot which they own. They didn't agree. One fine day, they brought labourers and materials and started paving the road without our knowledge. My dad lives 20 kms from this place, and when he got word of this he went there and lodged police complaint and also got a stay from court. They also filed case against us stating we don't own that part of the land. We have all documents of the land. For the last 5 years or so the case has been going on. I had given my dad a power of attorney to do the litigation and sell land if needed while I am abroad. My dad is retired and a diabetic patient and I am still abroad for work. In all these years the only progress we heard from the advocate is that court appointed someone to do a resurvey and based on that advocate had told my dad that it proves that we own the disputed portion. For several months there has been no progress and couple days ago the advocate tells my dad that he cannot do the litigation on my behalf so we may lose the case. He asks my Dad that I should go to India now. I cannot describe my frustration and helplessness here. I mean we trust this advocate and after taking us on a ride all these years he finds I should have filed petition? Anyway, I would be much obliged if any of the legal experts here can provide me some advice on what I can/should do here. Thanks much!