Call the police or call the bank. If it is stolen, the bank will definitely ask you to return it. It will be unclear then. Please apply to the bank to stop using it. It usually happens that the card is copied. There are three situations: 1. Criminals install magnetic stripe stealing devices on merchants' POS or ATM withdrawal devices, steal magnetic stripes, and then make fake cards for consumption; 2. Some credit card third-party service providers have information security cases, and a large number of credit card transaction information has been stolen and used by criminals for fraudulent transactions; 3. After the card was lost or stolen, the card issuer was not contacted in time to "stop payment" and fraudulent transactions occurred. The following measures can be taken to prevent credit card theft and related losses: 1. Leave the real and fastest contact information in the bank, and contact the bank to update it in time when the contact information changes, so that the bank can communicate with the cardholder quickly in an emergency. 2. When swiping the card, it is best to open the SMS notification service on the mobile phone, so that the bank can send the transaction information to the cardholder in time. 3. Get into the habit of keeping transaction documents, so as to facilitate reconciliation and provide them to the bank for investigation when problems occur. It is best to carry the bank phone with you, and report the loss of the card by phone immediately if you find it lost or stolen. 4. Do not disclose your card number, expiration date and other information at will, and keep your cash withdrawal password and credit card properly. 5. When spending by credit card, try not to let the card leave your sight. 6. In case of abnormal withdrawal from ATM, if it shows that the transaction is successful, but the machine does not spit money, it shall promptly notify the acquiring bank and ask it to issue relevant certificates if necessary. 7. When paying online, you should choose a well-known and reputable website for trading. 8. At the beginning of each month, you should pay attention to the statement of last month. If there are abnormal transactions in your own statement, you should contact the bank in time to inquire and make a refusal. 9. Cooperate with the bank to remind and confirm the transaction by SMS and telephone, and timely inquire and refuse to pay if any abnormal transaction is found. 1. When handling a credit card, it is best to use a signature that is difficult to imitate. At present, the most important thing for the landlord is to call the bank and call the police. So as not to bear huge losses.