The solutions to the problem of a duty-free shop card being taken by someone else include immediately contacting the duty-free shop customer service, freezing the credit card, calling the police, changing passwords and monitoring credit records, etc.

1. Contact the customer service department of the duty-free shop immediately: You can contact the customer service department of the duty-free shop immediately to report the card theft and request to stop the use of all stolen cards.

2. Freeze credit card: If you also use a credit card when using a duty-free shop card, you can contact the credit card company immediately and request to freeze the credit card to prevent further losses.

3. Report to the police: If the duty-free shop card is stolen, you can report it to the local police and provide all relevant card information so that we can assist in recovering the stolen card.

4. Change the password: If you set a password when using the duty-free shop card, you can change the password immediately to prevent others from continuing to use the credit card.

5. Monitor credit records: If you are worried about credit card and duty-free shop cards being stolen, you can monitor your credit records regularly to ensure that there are no unusual transaction records.