How can I reclaim land encroached upon by my neighbor?

I hold a share in three adjacent parcels of land, partitioned by mutual consent among my brothers, the titleholder, and my uncle. The northern neighbor is manipulating his boundaries by measuring 20 feet away from a fixed northern boundary ("bandh"), encroaching on my property and causing disputes during construction. I hired an Amin from the Land Record Office (Tehsil) to measure the land. After three days, it was confirmed that the northern boundary, previously assumed to be 20 feet away, had no extra space, reducing my land area. When this fact emerged, the neighbor objected and halted the government surveyor's work. My neighbor has encroached upon approximately 4,000 square feet of my land. A permanent house was built on part of the disputed land over 12 years ago, while other parts remain vacant. This area is now within the municipal boundary. I need advice on how to evict the neighbor and reclaim my land.