Facebook help center

To access the Facebook Live Chat feature, go to the official help page +1-(833)-561-9222 or click on the link below the chat button. Conversations will appear in your Messenger tab. You can also click Message at the top of someone’s profile to message them. Facebook has a live chat support

Source: https://community.clover.com/questions/91077/what-if-someone-hacked-my-facebook-and-changed-my-10.html