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

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

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 picked up the phone and male voice said "Attention all visa and master card.."  I immediately hung up.

Receive calls from a toll free number and then when called back to check we are charged an international call fee. ?We are on the DO NOT CALL list but apparently it doesn't matter to this company.  I usually do not answer unsolicited toll free numbers, but when we receive numerous calls from a particular number I sometimes check to see who they are .  Do not do this as we have been charged international fees on our phone bill.

A long-winded recorded message.  I left the phone on the desk while I worked.  After about 10 mins. I picked it up they were just winding down, asking if I would write my congressman, etc. about health care.  Seemed to be AARP or AARP affiliated.