This is a fraud campaign currently active in Canada using a series of Iristel VOIP numbers. The objective is to obtain your credit card number and drain your account.
If you attempt to "opt out" your number will be confirmed as live and added to a suckers list for repeated future calls.
This same phone number called me in the middle of the afternoon of Saturday, June 11, 2013 The caller asked for me by first name and so I asked who was calling. He said his name is Steven Murray so I asked him did we know each other. He said no but then said something else very, very quickly and hung up.