I won't answer if the Caller ID reads "Unavailable," and I don't recognize the area code.  No message left.

No one is on the line when I pick up. I put them in my reject list; they still call. How do I get them to stop?

CALLS EVERYDAY... leaves no message. I called back requesting to be removed

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.

Got the call.  Where am I right now?  In Canada.  Look it up and find it is the same group of people that were calling while in the US.  There are two of thse groups, one out of St Louis and one out of Atlanta.  Atlanta does most of the CC modification calls.  It is a bunch of people who hire the boiler room call centres to make the calls and when they hook you they will give you another 800 number.  The Do not call list will not work, they ignore it, in fact one claim is they down load the list of do not call numbers and now have a complete dialling list and do not need to pay anyone for the numbers.  Cut the cost and we are all feeding their lists.  Further, a Canadian company call pull in the US DNC list and dial away and vice versa for calls into Canada.  The only way you can make this stop is if you call your State Attorney General and file a complaint.  Go to the State website and write an email.  Take the time you would waste answering these endless calls and send an email.  If you did that every time they called, the AGs would get about 3-4000 emails a day.  You think they would do something?  Just to make the emails stop!

Take back your phone, use the systems that has got us all trapped on this hamster wheel.

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.