Purchase ola vouchers of Rs. 100 and get 60% cashback in form of crowns, so if you buy a voucher of 100, you get 60 crowns back, if you buy 5 such vouchers, you get 300 crowns.
These crowns can then be used to buy vouchers from flipkart, amazon etc, or can be used to recharge.
Validity of OLA voucher is 30th January 2016.
Update your crownit app to see the offers on ola.