Gruha Kalyan — real estate fraud

I have booked a flat in gruha kalyan domlur erica project in dec 2015, when they did not start the construction even after 12 months we demanded them for refund, they provided cancellation commitment letter & within few weeks their office at hsr layout was closed, later made a police complaint, fir, legal. Notice etc but till today no result
It seems they have paid portion of the amount to builders but the builders have forefited the amount because they did not fulfill the agreement so atleast the amount which was paid to builders should be brought back in order to make repayments