File a complaint with the FCC Online here:  http://esupport.fcc.gov/complaints.htm  

These people should be shut down because they use automated machines and do not allow you to tell them to stop.  Their mailbox is "full."

Received a call while driving and there was no one on the other end.  The Caller ID indicates that the origination is in Canada.  I do know that a lot of fraud is now coming out of Canada, targeting people here in the US.  The most often used is by mail and includes a large check that is drawn under a legitimate company name and a phone number in Canada to call to inquire how to get the money... which involves sending money to them for "taxes" on the "winnings"...

Though I have tried to "Call Block" this number through ATT, the service will not allow me to do so!

Don't know who this is but tired of them calling and leaving no messages

If they are indeed based in Canada -- filing a complaint with the FCC or FTC won't matter, will it??  The U.S. agencies would have absolutely no jurisdiction. I am very annoyed with these calls, as well.

DIDN'T LEAVE A MESSAGE.i CALLED BACKED AND IT SAID THE VOICE MAIL WAS FULL.wILL NOT CALL OR ANSWER ANYMORE

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-