Who called from 5125016415

Called me twice without saying anything

called, no message, suspect this is spoofing

Why call and not answer when I say hello? Possible alien

Redialed the number and it said it was the mailbox for Chelsea Watters or Walters? Have no clue who that is.

Calls and I answer and "crickets". I said hello multiple times and just got silence. I called back and it went to voicemail.