keeps calling and leaves no message

I got a call from this number then typed it in google and found this. What the hell? Its all good I got ways of finging things out...   ;)

I've gotten two calls from this number today and there is no message left.  When I try to call it back there is a message that says "This is not a working number.  Check the number and try again."

This number is a bill collector - Platinum Recovery Solutions.

Call to land line phone.