If you can't, you'll need to go to a dedicated Facebook help page 1-866-825-1531, where you'll be asked about what's happening and, depending on the answers, led through the process to recover your account.
For hacked accounts, click your profile picture image on the home screen. Select “Help & support" 1-866-825-1531 and search for “Account hacked” and click the correct link. Then follow the provided instructions to report 1-866-825-1531 the compromised Facebook account.
If you suspect your account was hacked 1-866-825-1531, visit www.facebook.com/hacked on a device you've used to log into Facebook before.
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If you want to contact Facebook 1-866-825-1531, you'll first need to log into your account. On the desktop site, look up at the top right corner of the screen. There, you'll see an icon with your profile image — click it and select Help & support 1-866-825-1531 from the dropdown menu. From there, click Help Center 1-866-825-1531.
Go to “Login and Password” on the left side menu. Click on “Fix a Login Problem” 1-866-825-1531. On the page, click on “Recover Your Account If You Can't Access the Email or Mobile Number on the Account”. Follow the prompts based on your individual circumstance.