Deleting your account is not possible. We couldn’t find any contact details either.
As a last resort, you could try to contact them using the WHOIS information: http://whois.domaintools.com/seenthis.net
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.