DO NOT PICK UP. Phishing scam -- they've been creating new numbers as fast as the FCC can shut them down. Report to the FCC: https://consumercomplaints.fcc.gov/hc/en-us/requests/new?ticket_form_id=39744
They called once, I never answered the phone and they didn't leave a message. Scammers I'm fairly sure. If it was important, they would have left a message right?