I believe that it is a number automated for 500 Fast Cash. Another number that comes up with same automated message is 918-442-0317 and they ask you to call back 1-800-404-8679 or 1-800-404-8835.
I have told this company that they are calling the wrong number. When I asked to speak with a supervisor, they put me on hold and never came back. This is a collection company.