Received call.  Did not answer.  No message left.

RECEIVED A CALL FROM THIS # FOR 2 DAYS HAVE NOT ANSWERED NOR HAVE THEY A MESSAGE.

Same thing they call don't leave a message. WHO ARE THESE PEOPLE THAT CALL AND DON"T LEAVE A MESSAGE

I got a call from this number last night.  My call blocker caught it so they did not have the chance to leave a  message.  I can not find anything about this number when I research it so Its probably a spoofed number.  Curiosity got the best of me so I called it from a blocked number in a conference room where I work.  No identifying info when they answer the man on the other end says is "Hello, how may I help you?"   But they will not say who they are even if you ask.  

This place has called me everyday for the past 2 weeks. Never leave a message, and just like everyone else can't find any info. Today I received a call from another AZ number 623-321-2638. Same issue.