I too have received calls from telespamming scum like this. Basically what happens each time is that they call and only allow it to ring long enough to register on the caller ID. These scumbags are counting on the fact that you are going to see the missed call and instead of them having to pay the call costs to telespam you, you call them, and they spam for free. I know for a fact that they are simply sequentially dialing and possibly only targeting blocks of numbers on mobile carriers. The reason I know this is a few people in our family got T-Mobile phones which were activated at the same time and the numbers are almost sequential, each time this happened, all of our phones received calls from this same unknown number within a few minutes time.
The last number I got a call from like this was 1(786)264-5272 which is (or was?) a number provided by "Tcg South Florida" and in Miami, FL. Each time I called to see what it was there was a recording in Spanish only saying: "You have just won a vacation" or "You have just won prizes". Unlike the number mentioned in the original post this is not a Canadian number, but what US laws apply to this type of telephone spamming tactic? They are clearly sequentially dialing without the intention to connect the call at all and only providing a machine/recording when you call back. I'm not sure what would have happened if the call was caught soon enough to connect it, but I can guess they would have simply hung up.