When you try to login to the website via a web browser, after entering your username and password and click "login", what happens? What do you see? Have you recently cleared your browsing history, cookies, and cache?

What about a mobile app? May want to delete the app, restart your phone, and re-install an updated version of the app.

But, none of this would explain why the phone agents can't see your account. Is there any chance your account could be flagged for fraud? When was your last Hilton activity?

As others have said, Twitter is the quickest and most thorough method for customer care issues. However, in this instance, the HiltonHonors Ambassador on this forum may be your best bet.