This number has called me every day this week.  When answered, it asks you to hold (sign of an auto dialer).  When forwarded to voice mail, they do not leave a message.  When you try calling them back, the recording says to press 9 if you want to be added to a no calling list.

I don't press anything, especially when you don't know who the call is from.  9 could authorize acceptance of charges or something.  Not happening!!!