We had paid advance money to book residential plots, which were yet to be approved by the authoritie

We had paid advance money to book residential plots, which were yet to be approved by the authorities. We had paid Rs.50000 per plot and also had convinced 2 of our relatives to buy this property, as the area seemed to have a potential for growth. There were also other esteemed people of our town, who had invested in the property. So, in good faith we went ahead and paid the booking amount in 2010. We were given the receipt of the payment. However, till date we haven't received any update on the property and when approached, the real-estate developer says that the approval is still under process. Our further investigation on this particular developer shows that he has the practice of taking land which have unclear ownership records and selling it to innocent people. Given this background, we want to get our money back with the bank rate of interest. We had sent a written letter through R/D with Acknowledgement. The company has received the letter, but there is no reply even after 2 months. We want to explore the legal option and get our money back.