My husband has just had the same scam cold call offering a free holiday in Florida.
He was suspicious when they asked for his Credit Card number so ended the call and did some online checking. Came up with the news that this is a scam operating out of Orlando Florida so in spite of the disingenuous Sarah's blandishments drop it like a hot brick if it comes your way!
As it says earlier in this forum - if they are connected with your Credit Card provider they will know your card number and be able to tell YOU what it is!