Use the link to delete your account. If that doesn’t work, you could still write a deletion request to the named address there.
URLS:
http://www.wix.com
http://support.wix.com/index.php/Delete_Account
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.