stolen account!

Try changing your password first:

Select the “Lost ID/Password” option next to the login section of the main Z8Games page (www.z8games.com). Submit the email address you entered upon initial registration and your password will be emailed to you directly.

If you can't, you can always try contacting support here: http://support.z8games.com/webform_new.aspx
Just make sure that you CAN actually prove that this is your account. If you can't, support won't help you.

Finally, accounts don't just get stolen...Keep all account information to yourself and don't download any hacks or stuff like that.