Under Section 63 of Real Estate (Regulation and Development) Act, 2016 if any promoter, who fails to comply with, or contravenes any of the orders or directions of the Authority, he shall be liable to a penalty for every day during which such default continues, which may cumulatively extend up to five per cent., of the estimated cost of the real estate project as determined by the Authority. Issue notice to builder seeking compliance of the order of Authority after that file an appeal under Section 63 read with Section 69 of the Act seeking imposition of penalty and out the recovered refund of advance and interest of you. Only procedure will cut procedure. You need to properly follow the procedure and take it to logical end.