I can not have access to my account!

how can i solve this error,i don't have access to my account and i change my password several time.. but this not working any more and i got massage from face book like this:

You recently changed your Facebook password. As a security precaution, this notification has been sent to all email addresses associated with your account.

If you did not change your password, your account may have been the victim of a phishing scam. Please learn more about this, and how to regain access to your account at https://www.facebook.com/help/?topic=security

Thanks,
The Facebook Team

pleas some one help me.
merci