I was driving when the number popped up on my caller ID, I didn't recognize it, so I didn't answer, and the caller did NOT leave a VM.
The call rang for a long time though, so it made me think it wasn't one of those standard phone dialers - the ones which automatically go to an answering service after like 6 or 7 rings.
Other companies that normally want to harass folks for their funds, tend to leave a (many) voice messages - usually with some sort of threat included, so I think that wasn't the call either...