Big time frauds. I bought 2 flat in yelahanka call...

Big time frauds. I bought 2 flat in yelahanka called Sky elegant which was supposed to start the construction on Nov 2017 but still it is never started now, and paid the booking amount. Later after a month and half, they asked me to pay some 10% amount though the construction was not started but per them if we don't pay the gonna cancel our booking and I paid the amount. After again 2 months they called me up and said pay 20% otherwise they going to cancel my booking. It was always kind of black mail saying the prices are high now than the price which I booked and people are in Q to purchase it. So a I got frustrated and cancelled the flats. Initially they said if we cancel they will repay in 7 working days but I had to run behind so many people coz nobody was picking the call and they never turn up. Got my money after 60 days of struggle.