Usually, if you win a contest from a local radio station, they will call you. And they only call once, so pick up the phone. Otherwise they pick another winner. They don't leave messages.
I've received a phone call for a Turtle Cheesecake I won. Delicious.
And lastly, last week, i received a phone call for a trip that i won, and turned down , because it kinda came across like a time share thing, and they also wanted me to put upfront money saying it would be reimbursed to me, it didn't seem very right to me. It's been my experience when you win, your not asked for any money. Everything is paid for.
Yes, I've received phone calls from wins. Mainly from the radio stations. I always tell people enter the local contests, radio stations, local papers. they give away great prizes.