Who called from 7203708901

I keep getting calls from different 720 numbers that all come up as faxhalt.

We get junk faxes from this number an the top of the fax says DoctorDirectory.com.  The fax comes addressed to a physician's name, and the header shows 800-820-0434 which also comes up on the Internet as having to do with DoctorDirectory.com.  It has something to do with a survey.  These faxes are unsolicited.

Call daily at different times. Series of beeps, no voice. No message. Very annoying.