https://vocal.media/bookclub/is-650-543-4800-facebook-a-legit-facebook-number

The phone numbers 650-543-4800 and 844-607-8788 are often falsely portrayed as Facebook customer service lines. However, neither 650-543-4800 nor 844-607-8788 are official support numbers for Facebook. Scammers frequently promote to trick users into divulging private information.