I have.  This number called today...twice...right after each other with no voice mail left.  I don't answer numbers I don't recognize.  If it is important, they would leave a message.

This number callled me twice as well within a minute of each call. No coucemails left. I have since blocked the call

Received a call with no message.  Please investigate this number.

Missed call, and called back. Recording claimed to be a debt relief service.