I am also on the DNC list, but every time I try to get some info to get them stopped, they hang up.

This time, I played along.  The automated message said they were from "Credit Card Services".  When I spoke to a representative, he asked if I wanted to lower my credit card rate.  I told him I did.  He asked if I had over $4000 in credit card debt, I told him I did. (even though I have no credit card debt.)  I was trying to get to the point where he would ask me personal information so I could question him back.  

But then the curious question happened:  "Are you over 70 years old?"
I replied no, thinking a credit card company would be interested in younger people.  With that, he hung up.  

It concerns me that they are targeting older people exclusively.  My grandparents would probably fall for this-

My parents have received numerous calls from this number and no on eis on the other end.  I call the number back (# on caller id) and it rings busy.  I added my parents number on the "do not call" directory but I believe these people are working from an old list.  Its very irritating.  I am sure the telephone company should be able to do something about this issue.

you go girl

Caller ID says Unknown Name, I called back and it says message box full.  No idea who it is.

Have received numerous calls from this number.  Last week my wife told them
to stop calling us as we were not interested.  We then received two phone
calls at 4:20 and 4:20 a.m. on Saturday, March 21st with them replaying my
wife telling them not to call us.  This number needs to be investigated and
shut down by the Canadian Government.

I got a call from this number.  first there was a recorded message saying that President Obama wants us to re-negotiate our mortgage then had options to press.  I pressed one and a girl on the line asked me if I was interested--I told her I had no idea who she was and she hung up.  I'm worried that this is a scam and others might be pulled into it.