Facebook does not have a phone number for regular users to call. It does have an online help center, located at https://www.facebook.com/help/.
If the recipients call the number, they will get an automated message asking them to enter their account credentials, personal information, including their social security numbers, bank account numbers, or other information the cybercriminals need in order to gain access to their potential victims’ accounts, steal their money and use their accounts fraudulently.
Recipients of the fake messages who have called 844-735-4595 and given out their banking information are asked to contact their banks for help, change the password of their online accounts, and contact their local authority if they gave out other sensitive information.