Call me on my cell.  Recorded message.  Don't even have the nerve to talk in person , don't know how the idiot got the number!

said they were airmiles and I won 25,000 pts

I too got one at work- number is registered to a john wheatly in leduc- tried to phone back- no answer- not even a dialtone. I was the winner of 250,000

This call does not originate from the Leduc/St. Albert number.  

Its what is known as a "spoof" and if you do respond to it in any fashion, which includes having your voicemail pick up, then the scammers, have confirmation that your number is valid.  What they will sometimes do is use your valid number, spoofed of course, to do a new dial-out to another province/state when the number they've been using becomes known on sites like this.

Some things to remember:  
If you don't recognize the area code - don't answer.
If you haven't actually bought a "lottery" ticket from a reputable organization such as a Children's Hospital or Cancer Research fund:  How can you have won anything?
Legitimate busness callers will always show up on your call display as the company name, and in this day and age of pesronal information privacy, being contacted directly by a business that you haven't initiated a "callback" from, is almost unheard of.

(780) 739-8787 Got a call from this number the message saying its from Air Canada and I a winner of 200000 Aeoplan miles and press 1 to clain. When I call back I got engange tone