I just tried to call from a land line and it automatically went into voice mail indicating that "the Google voice subscriber is not available to take your call, please leave a message and..."
I just got this call at about noon central time on 8/11/2011 to my cell phone (which is on the DO NOT CALL LIST.) It was the same recording about lowering a credit card interest rate. The recording didn't identify the institution/company. I pressed "1" at the prompt to speak to someone. When someone answered the phone, I immediately asked what the name of the institution was. After I asked this question, they immediately hung up on me. Definitely a scam if they won't even identify themselves.
I have been getting calls from these people for 6 months now. I always push 1 to talk to them and see how long I can keep them on the phone before they hang up. I never give them any personal information, just fake stuff. So far my record is 55 seconds. Can anyone beat that? It's fun wasting their time like they are wasting ours.
Also this message seems new. You now have the number 3 option to take yourself off the list. I highly doubt that is the case.
Another interesting note. If you call it back you get a google voice voicemail account. Previous numbers never worked. I left them some interesting voicemails.