i have booked a 2 BHK flat in South Green city and paid 20% of price in Oct13 but still not got allotment letter

Is there anybody who has any information on the fate of the project. I am very sceptical of the project after paying visit to the office and site in Oct'14. I visited the office on 28 Oct'14 to get the update and I was told that agreement to sale will be issued in Nov'14, but till now nothing heard. I visited the site also during that time and I am disappointed to find there is no work started so far. There is one structure constructed at the entrance of the project which was told that sample flats are being constructed, however, 60%-70% work were still to be done in that building itself. I am very disappointed that the project was about to be completed by 2015 and it is still constructing sample flats or in other words no work started. I have made the payment of 20% of the flat value and trapped in the project. I don't know what shall I do now?