no message how random

Multiple unwanted phone calls from this number, silence on the other end hangs up after 20-30 sec., when called back there is a fax signal.
?????

Has called me twice today,  I answered once and it was Richard from Hiring Our Heroes.  I got disconnected, and every time I have tried to call back, I get a fax signal.  Hiring Our Heroes is a legitimate organization, but they are based out of DC, so why is someone from Michigan calling me, and why is the return call a fax number?

It could very well be used in "spoofing" the phone number. A lot of the scammers spoof numbers so you can't get any pin down details on them!   All you can do is report the numbers that show on the caller id sadly.

Sick of the same call/hangup from this number, 313-447-2737. It was Hiring Our Heroes b/c the guy spoke to me once a few days ago from this # and I told him to call me back b/c I was busy. Sick of the calls. I did call back and it's a fax??