It's some dumb pre-recorded multi-level marketing spiel.  They called my voicemail twice in 5 minutes.  I hung up before listening to what MLM company it is.

I've gotten the same pre-recorded message 7 times in 4 days.

Whomever it is keeps calling all times of day & night.  Never leaves a voicemail.

Multiple calls over the last several days.

I have been receiving numerous phone messages in the last few weeks from a guy by the name of Karl Jacobsen, this is the name in the caller ID, sometimes it doesn't show a name though, and he gives another number to call if you're interested in finding out about his program.  I googled him and I think he has some type of travel program, but I saw some scam info about him, whether or not it is true, I cannot say.