Received a call from them. Automated voice said "Thank you for choosing Marriott Hotels, your confirmation number has been drawn to win a free stay" so I waited a minute. After a few rings, a woman picked up and asked if I was over 30, which I am not. It was very hard to make out what she was saying, her English sounded broken. Then she said "Sorry have nice day" and hung up. When I called the number back, it said "the number you have dialed is not in service". Definitely a scam.