Flipkart — refunding the money for online payment takes long time

Address:

Flipkart, 641001

If i orederd a product your asking for the money for the product so we are paying immediately, but for refunding the money for the product if the was cancelled your taking more than 7 days to refund. It is simple we are paying immediately for the product but why don't you refund immediately if we cancel the order.
I am paying instantly for the product so you should also refund immediately if my order was cancelled.