Did not answer as there was only a phone number and no name. Checked voicemail as it said I had a message, found only silence and no noise in the background. Nobody said anything. Normally if they are hiding their number it will say "unknown name" or similar, this had no information other than this phone number.
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.