Double registration

We have bought the plot 10 years back and recently the brokers are saying more than 100 plots in the layout are double registered. Also they are asking to check with a different survery number by adding /1. When i verified the EC with my survey no 1927 and the plot details it was fine and it is on my name only. But when i tried with surveyno 1927/1 then i am able to see that it is registered one year back to some one else by some other party and it shows the same boundaries and layout of my plot. WE approached the registeration officer and filed a petition to cancel the registration. He signed the petition and says it is false registration and to approach through court. They are also suggesting to meet sub registrar as he is done the registration and if he can do some thing.. Please help as how to proceed... As my EC is fine i will never come to know that it is registered with different survey no. unless the broker said. And all the brokers in that area are aware of this so i cant sell my property even if EC is fine. IF i want to retain the land what is the process i should do..