Lodha Group — Not getting refund of my booking amount.

Address:

room no 1110 panchasheel ekta society, new gautam nagar, govandi 400043

I have booked a flat in Lodha Crown Dombivali and paid the BA1 and BA2 amount of Rupees 1, 79, 886
now i want to cancel the booking due to critical family condition, but lodha is denying to refund the amount. They are giving me the voucher which is useless and can be only used for booking of Lodha Projects.
I have not done yet registration also, still they are denying to give the refund.