Normally I don't answer numbers I don't recognize, but I was in my car and answered without looking. When I answered a man asked "Hi can you hear me okay?" I said yes. He stated that he was from "customer service" and that I was selected to win a vacation free of charge yada yada yada. At that point I told him I wasn't interested and hung up.
Just now (later this evening) the same number called and didn't leave a message. I blocked the number.