Yes, 650-543-4800 is an official Facebook customer service number. In some cases, users may also be directed to +1-844-595-4943 for support. Before calling, consider visiting the Facebook Help Center, which offers solutions for billing issues, technical difficulties, and account settings.
https://philpeople.org/profiles/chat-with-live-agent-is-650-543-4800-facebook
https://philpeople.org/profiles/chat-with-live-agent-is-650-543-4800-facebook
https://philpeople.org/profiles/chat-with-live-agent-is-650-543-4800-facebook