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

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

I reported this to the FCC complaint section which is separate from the Do Not Call Registry.  Coogle FCC Telephone Complaint.  They take this seriously and do follow up.  Register your complaint. There is power in numbers

i didn't answer the call.  It appeared they left a message, but when
I went to listen to my messages, there was nothing.  just a blank.

Telemarketing scum.  Guy went a**hole on me when I asked him to remove me from their calling list and never call my number again.  He said he would call back tomorrow, the b****rd.  (I'm on the US National "Do not call" list.)

Call came @ 2:11 PM EDT on 08.14.2009 -- caller ID read OTTAWAHULL, ON, apparently originating in Canada. If I don't recognize the name or number on the caller ID whomever is calling is wasting their time because I don't answer.  I've been on the do not call list since day one but that list means absolutely nothing because it hasn't stopped the calls.