No voicemail

Person hangs up immediately after speaking.

I also received a call from his unknown number

Answered call. Caller mentioned something called 'Chiefs of Police'.  Answered 'Thought police organizations didn't solicit over the phone'. Answered 'No problem' and hung up.

I picked up phone. Person at other end knew I picked up the phone but I didn't say a word. He said hello twice gave his name as Mike Brumat. When I did not respond he said hello once more and then hung up.