Who called from 3012346207

they called and no answer

I let the answering machine pick it up because I didn't recognize the number.  Someone actually was on the line, said hello a couple of times and then hung up.  I didn't pick up the phone because I didn't recognize the voice.  Came up as Clinton, MD on the caller ID

Called me twiced today, I called back and nobody answers

Get a call about once every two weeks,   let answering machine take, they ALWAYS hang up. never leaves a message

Caller ID said Clinton MD.  I didn't pick up because I don't know that number.  Don't know how they got my unlisted number.