866-699-9929

said that I won a free trip to Las Vegas

Said the same thing to me, that I had won a trip to Las Vegas or San Diego and that I had won some kind of lottery.  She claimed that she was calling from Worldmark Wyndam.  It looks like it is one of those time sharing things where you get to stay free but need to listen to one of those long sessions where they try to pressure you to buy...  Not sure what to make of it.

Found this... http://www.ripoffreport.com/reports/0/297/ripoff0297405.htm

The moral of the story might be to take the free vacation but don't be pushed into buying a time share that you will never use...

Got a phone call, told me I had entered my name and phone number into the sweepstakes, said I won a trip to Lake Tahoe all expenses paid. Her name was Mikaela. Told me to call her back 1-866-699-9929. I didn't.
Got the same phone number call a couple of weeks back. Didn't answer and they didn't leave a message, but this time they did.