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

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.

I have received over 50 calls from this number ...all dead silence when I pick up the phone. Appreciate any help how to get this to stop.

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-

Have received numerous calls also.  I called back from my home phone and got a message that the number was disconnected.  Called from my cell and work phones and got a message "I'm a big jerk and I leave erroneous telephone calls with no messages".  He is a big jerk and he does make erroneous telephone calls with no messages.

It's a scam.  Shows (613) 216-2172 "Ontario" on caller ID.  They are tryomng to get your credit card information.  File an online complaint with the FTC here:
http://esupport.fcc.gov/complaints.htm