just called for the third time in 2 days... anwered once and disconnected

I received a call from this number and a man said that he is calling on behalf of Visa and Mastercard to enter me into a sweepstakes to win a trip to Disneyland and other fabulous prizes.  He began to ask me questions and I answered a few such as my age and marital status.  Then he asked me if I am enrolled in college.  I replied "No, I'm a dumbass", then hung up.

They told me I had won a sweepstakes and I immediately hung up. I don't know who they are!

Got a call from this number telling me I won a sweepstake and then they proceeded to try and sell me a lot of magazines - I hung up

they keep calling and calling no answer when i call back no answer.