need to know the address. their voice mail is full

Have appointment at 2:45pm but do not know the adress. voice mail is full

They called saying that I have won a prize and am 1 out of the 150 contestants for a prize 2 of them were some cruise options, 1 was a 42" TV and 3rd one was C$1500. Their office is on 1510 Drew Rd in Missisauga. Don't know if it's legitimate as yet