Keeps calling and asking for my boss, who is a very busy person.  When informed that the Boss is not available, they say they will leave a message, but they hang up instead.  Guess they can not take a hint that their calls are not wanted!

Received a phone call today from this number.  Wanted to speak to the Administrator -- offered them VM, as the "Administrator" was out of the office.  They said that would be fine, but before I could transfer the call, they hung up.  What a bunch of jerks!

Called and wanted to speak with the person "in charge of safety issues".  The person responsible for that in our company was not in the office, and I offered VM.  They wanted to know if there was a better time to talk to that person.  I responded that they are in and out of the office a good deal of the time and was not sure just what his schedule would be at any given time.  The called said they would call back another day.  

Always a red flag when they don't know the name of the person they need to speak with, won't leave a message and want to call back another time.  

Got news for them -- they won't get to talk to my boss then either; this number is going on our blocked called list for sure.

Caller indicated they were "calling on behalf of" (red flag!) some publication and wanted to send me something "free" (yeah, right!). When I started to respond we would not be interested, they hung up on me - very rude!