This is a fraud campaign currently active in Canada using a series of 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.
Received a call indicating that I had won a trip then was presented with an electronic survey which I responded positive by continuously pressing '1' and then at the end of the call nothing happened and eventually a dial tone. I guess they didn't want to give me the trip and all I was going to do was drag it out and frustrate them.