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

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.

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

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-

I keep receiving this call. I called it back and it says the number is disconnected.Ottawa  ON  (613) 216-2172 appears on my caller ID

Just received a call this morning from this number. ?I do NOT answer any calls where the ID is "Blocked", "Unknown", "Unavailable", Anonymous" or "Out Of Area" or I don't recognize the caller ID.  The caller ID on this call was "OTTAWA   ON", no name and then the number.  Since we know people in Ottawa, I called the number back twice and both times I received the, "This Number Is Not In Service". "Please Check The Number and Dial Again"!  From what has been reported here, I see that it s a scam.