Mar 12: "Christopher" with "client control group" scam

Man's voice: "Hi. This is Christopher with uh client control group. And this is my last attempt to legally reduce your credit card debt down to zero? So call me back at 1-800-489-1631. Once again, we can legally reduce your credit card debt to down(sic) zero. Call me back today, 1-800-489-1631."