I got a call from this number earlier with the same pitch - one of 5 prizes that had to be drawn 'by your own hand'.  They promised no money, no purchases, no cost of any kind.  The company was called F Source International (they spelled it out for me although "John" was extremely difficult to understand.  Once the senior manager came on to confirm the claim code, I asked what the business was and he gave me some thing about having to give the prizes to make money since it was a new company - but the connection was terrible - very garbled.  Anyway, I told him my husband said we couldn't go.  Then I googled the company name and the only thing I came up with was a thread on this site for the number (416) 548-5983.  Look it up - some very interesting things they had to say, all of it consistent with my experience.

They keep calling me, and spoke to the manager who assured me we have won one of these 5 prizes and that we would no have to pay a penny for anything, arrange visit for today but we decided not to go, dont have a good feeling about it. they just called about 5 minutes ago. I wonder why they keep calling if we are not going. they said their name is  Asource Canada or soemething.they wont stop..

They keep calling me, and spoke to the manager who assured me we have won one of these 5 prizes and that we would no have to pay a penny for anything, arrange visit for today but we decided not to go, dont have a good feeling about it. they just called about 5 minutes ago. I wonder why they keep calling if we are not going. they said their name is ?Asource Canada or soemething.they wont stop..