Adel Landmarks Limited — Construction not moving

Hi, I had booked a flat in January 2012 in Tower A in project Cosmo Court in Sector 86 Gurgaon by the builder Era Landmarks Limited (Now ADEL Landmarks Limited). The allotment was done in February 2013 and BBA was issued in September 2013. The BBA stated that it will take 54 months for completion of project + 6 months which is unreasonably long. I have already paid 32.5% (Rs. 20 lacs ) of the basic cost of the flat which was a precondition for allotment. However, the construction at the site has been halted for almost a year now. I have sent numerous mails to the company to know the status of the construction of the project, but there is no response from them. I feel cheated by the builder. I just want to know when is the construction is likely to start. Also, if there is some issue with the project/builder then I wish to claim a refund of my money with 24% interest per annum compounded annually. Please advice.