Puravankara Projects — False promises and refund issues

I have booked a unit in Purva Zenium. They staff made me pay a 1lakh rupees blocking amount before sharing the legal documents delated to the project for verification. They promised a full refund within 15 days if I chose to cancel. However, after I cancelled, they said it will take 21 days to get refund then they said 45 days and now saying 60 days. They staff were unprofessional to lie to me just for making a sale. They group doesn't heed to customer complaints and the staff happily got away with it.