who is this?

Calls with just "white noise" background.

I keep getting the same, just the white noice.  No one is there.

Debt collector, identified themselves as Global Credit and Collections. They finally left a voice mail message today, usually this number leaves dead air on my voice mail.

Received yet another call from this number yesterday (on my mobile phone - so no caller ID available) after having somewhat of a break for several weeks -- used to ring me every day and often multiple times!  I called back anonymously and some guy answers asking how he can help me?  Excuse me? !  Quit calling me! that's how you can help me!!