I also called after an ad on the radio sponsored by Rosanne. What a mistake! I knew right as they answered with "Congratulations! You've won a trip to Las Vegas. Can you please provide me with your contact information and we'll be in touch with you within 30 minutes" that this was a scam.
Ugh. Sure enough, they wanted me to commit to something while I was in Vegas (I'm sure timeshare, but didn't confirm). I asked them to keep my information on the list while I called my husband to see if it was okay to commit, and the associate stated that he couldn't wait and needed an answer while we were on the phone at that moment.
So I said I wasn't interested, and since then I've gotten about 5 calls in 2 and a half weeks from the number. Each time I answer, nobody replies. I finally just called them back and asked that they remove my number from their system. We'll see how that goes!