Expat Properties — I'm complaining about my property not being registered

Address: Commissariat road, Bangalore

I had bought 2 plots at nidhi from Expat properties worth 8 lakhs and was told that the registration will be done in 2017 but haven't heard anything yet. The same thing has been done to so many other customers. It's too late now, need to take a action. I have all the details n documents