we get lots of calls from this listing called account svcs. They never leave a message and always call back from another unregistered number. Most likely a scam.

This is an invalid number, Spoofed AHats

Call from this Illinois area code to our Maryland number with no caller ID and no msg. left. We never answer calls from numbers we do not recognize, particularly when they do not send a caller ID. This one is consigned to the call block app.

Called at 2:01pm - no message left.
WE NEVER ANSWER UNKNOWN OR OUT OF AREA TELEPHONE CALLS - AND NETHER SHOULD YOU!
NEVER CALL THE NUMBER BACK.
Have now blocked the entire 779 area code.
Folks - you have had an answering machine for years - it's 2016; time to purchase a call blocking phone (Panasonic) or a blocking device that can block entire area codes (D*gitone).  We use both.
Please check Amazon for blocking phones & devices

Damn.  Called again and again, but no message.