Adjacent land owner grabbing my plot how can I protect my land

I bought a plot of 0.0390 acre from a layer after checking the seller's plot map, blueprint,title deed etc. Now it is registered, mutated and in titled in my name. But now My adjacent plot owner demanding his 3/30 fit is entire in my plot and with surveyer and his title deed he asked my wife to boundary my plot leaving his 3/30 fit and she did it by pressure. Now my plot is different from my purchase blue print and sale deed. Pls advice me how can I get back my 3/30 fit portion. Or is my seller's mutation, blueprint, sell deed fraud? Is adjacent owner is true? Pls advice me what to do?