Omaxe Ltd : APPARTMENT NOT CONSTRUCTED

We had applied for appartment in Greater Noida, under Palm Greens in September 2006 and had paid Rs 640000.00. We were alloted flat no 902 in Spear Palm Tower and an agreement document sent, which said that the flat would be handed over in 30 months. in the meantime as when demanded we paid the other installment of Rs 454375.00.
I happen to visit the site in the first week of December 2009 and I was shocked to see that there was whatsoever no construction done till date for the Spear Tower against which I have already paid Rs. 1094375.00 ( Ten Lac Ninty Four Thousand Three Hundred Seventy Five Rupees)
I have sent many letters to them asking them to return my money with interest but they are not replying.
Kindly help.

I am attaching the scanned copies of all the document: