If not, hang up. Be suspicious if people ask you for money to claim a prize. Swindlers often ask winners to prepay taxes, shipping and handling charges, a deposit or other bogus expenses. Don't do it. Reputable companies do not ask you to pay to claim your prize.
Prizes are free.
Never give your credit card number to collect a prize or enter a sweepstakes. Some con artists ask for this information as proof of your eligibility. You're likely to get cleaned out if you fall for this ruse. Scam artists will use your plastic for their spending spree. Never send money to someone you don't know.