Who called from 7204525525

Received call from this number.  When I picked up, said hello, there was a click and then a busy signal.  Comes up contact center on caller id.

"Contact Center" on caller ID, hung up the second I picked up.

I just received a call from this number.  I didn't pick and let it go to VM.  It must be an auomated call because when I block a number, my app, leaves dead air on my VM.  Automated systems generally only react to real voice.  That's my opinion on the matter and everyone has one so I'm just going to block the number.

Called cell.  No message.  No Caller ID.  SPAM

got a call from 720 452 5525 on 28th march evening. and i answered, they hung-up on me.