Call the customer service phone of the bank credit card, manually apply for changing the billing address, and ask the bank to reissue a new card. Generally, new cards that have not been collected are handled free of charge. The customer service staff of the bank will check personal information, confirm that the cardholder will help you change your address, and reissue a new card after calling. The card number will also change, so don't worry about the fraudulent use of the previously mailed card.