Ivc telcom city (employees cooperative society)

Hi All As we booked the site in IVC Telcom city near thindlu cross Devanahalli Bangalore 40*60 on an installment basis every six months we paid amount Rs 4, 80,000/- total amount paid Rs 14, 40,000/- they told me that they will hand over the layout within three years but till date no development has been made even they are not showing us the legal property papers about their progress kindly help me that I will get the paid amount with an interest please tell me the procedure how to procees ahead