According to our Google search, this appears to be the fax line of a Stop and Shop fax line in the Bronx (NYC). We've been called at eight at night and again at 12:30 in the afternoon (Eastern time).
Received a doctor's appointment confirmation for a patient <patient name withheld for the person's privacy> of Dr Zalte at Montefiore Medical Center. No idea who either party is and can't seem to reach a human at Montefiore who can help.