Actually I'm wrong.  This message was about credit card processing.  Still a robo-call though.  Caller ID shows up as Biz Funding.

Robo-call on my business number.  It left a one-syllable message and hung up.

I answered and no one was there. They are now on my Do Not Answer list.

Telemarketers - call it back and they allow you to place your number on a do not call list.