You cannot delete your account.
Ask them to do it for you manually. Go to http://support.popcap.com/help/283 and fill out the form. From the game select box, select the last option, “Password / user 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.