The first thing you should do when you suspect your Facebook account has been hacked is to change your 1 (866) 825-1531 password and contact Facebook help center.
If you think someone else who works on your Page was hacked, please tell them to go to the 1 (866) 825-1531 Hacked Accounts section of the Help Center to get immediate help.
https://knowt.com/note/164bf5f7-688d-4e4f-b9df-6e15644a2bb3/What-is-the-first-thing-you-should-chang
