IndiaBulls — mahavir patwa builders and developers

I Mr. Placid Miranda had booked a flat at the Galaxy Phase II of Mahavir Patwa in the year 2012 and had given the builder 20 percent down payment in white.
Flat allotted was in building A-4 in Galaxi Phase II on 3 floor flat number 306 measuring 66.44 Sq.mt.
I had gone into the agreement which is registered at the registration office at Bhiwandi, Registration date 17/1/2014. Possession date of the flat is also been defined in the agreement as 31/12/14.
Till date the building plinth is also not ready, i have been duped and would request a recovery with interest, its my hard earned money which i would not want to let go with such fraudsters.
I had visited site office and also Patwa office 2 years back for recovering the money they did'nt respond positivily. I feel cheated and would like to authority to consider this as a formal complaint against Mahavir Patwa builders and developers.