Neibhour not allowing enjoyment of our land

purchased a land by 1988.And subsequently we bought a adjucent land by 2005.Currently we applied for subdivsion.We came to know a part of our land was under actual possesion.A tree was there.But with the mutual aggrement we eveacuted everything and surveyer measured and he fixed the bounderies with stone.When we plan to construct the wall they are not allowing us and they are giving problem. As per FMB copy and our primary register document everything is very clear and no mistake from our side.But our opponent have made registration with wrong measurment.He bought the land after 10 years of our registration date.In the FMB his boundery measurement is only 118 feet.But he mentioned as 141 feet and got registerd. Moreover our lands have totally different survey number.His number is 145/2A, Mine is 145/9. The only thing is ,his land located at the backside of our land.Moreover we noticed that between our land and my opponent land there is a empty space of about 10 feet is there.