Who called from 9018819993

Did not answer, did not leave message

Did not answer, did not leave message

Been calling and hanging up when answered.

If you call it back, you get an automated message and you can opt out from future calls.

They keep calling and not leaving a message or when I pick up they hang up.  As noted above, call the number back, listen to the prompts, you can get your number removed.  Ensure you get to the point where you can add your phone number in to be physically removed from being called again.