Who called from 5307721219

Got a call, a woman said she wanted to talk to me (my name), then said she would call back and hung up.

Got a call just now and didn't answer. No message was left.

I've been getting phone calls.. most from a disguised debt collector for someone else, so this is serious for me. I'm sick of these calls, worse now in the last 2 months.
I called back this# which only showed up as Challenge Ca, minus the Area Code, so I looked up the AC and called them.  After 10" got a pick up recorded message, "Goodbye".

They are useing a spoof numbers voip don't trust anything they say

They never leave a message. Caller ID just says 'challenge ca'