Did not answer.  No message left.
Has called several times over the last week.
CID:   California

Picked up but whoever called didn't want to talk.  ROBO call?

Calls into Ventura County, CA & leaves no message.

Answered, hang up. Another call I let go to VM, no message.

Hang up call from a forged caller ID......IF you get a live person on the line stay calm and politely ask what company they represent. That will be the only way to obtain info for your complaint.  The caller ID's are forged so tracing them is useless. Blocking the number will do little good as they will forge a different number and bypass your block.  You must COMPLAIN to your reps in Congress and thru the Do Not Call FTC complaint site.  ALSO fill out the FCC complaint form.  We need as much noise as possible to get action.