How to cancel your online order?
Some websites offer the right to cancel your order electronically even after it is placed—if you act within the short time indicated. If you do not act within that time, you should consult the seller’s “return” policy and comply with it. Some return policies advise that if the box is not opened, the seller will pay the return postage.
Mainly on all major online shopping sites, You can cancel the order within 12 hours of your purchase. If you wish to cancel after that, you will have to send an email stating the order number and the reason for cancellation, after which they take a decision. They do not refund the bonus, if any, if you cancel after 24 hours.
You can cancel your order before the product has been shipped, but once you receive it, it can only be replaced if found defective.