hackers - tracking my iphone
Change your password (to make sure whoever is logged in can't change it).
Go to icloud.com.
Go to Settings.


Click "Sign out of all browsers currently logged in."
Change your password again (by now, they should be logged out).


As far as calling Apple to find out who did this, it is unlikely they will be able to tell you. You can try and call at 1-800-MY-APPLE.

Hope this helps.