Deeply blacklisted website Snapdeal offers no account cancelling option whatsoever. They’re also notorious for their lack of decent customer support.
Try to politely ask for account removal here: http://www.snapdeal.com/info/contactus – and hope for a response. Tell them they are blacklisted on AccountKiller.com, it might help ;).
Please note that AccountKiller.com is not associated with the business listed on this page. AccountKiller provides easy-to-understand instructions and guides on how to cancel charges and relationships from the list of businesses on our site, we have no affiliation with these businesses.