Calling this number back results in an error message that says the phone number is invalid, disconnected, or no longer in service. Which means whoever called was using a spoof number and you cannot determine who is responsible. If someone is using a spoof number in the first place, it is almost guaranteed it is illegitimate.
They either get your number from some other list or they just do random dialing until a phone rings. If you answer or goes to voicemail.... Bingo! They now have a real number....