The last time I called customer service to check the card, I got the answer that "all debts will be paid off on the day of the bill, and there will be no interest next month." The problem is that you may not receive the bill on the billing date ~ when will it be compound interest ~ The solution given by the customer service is "save some money in Carido, and don't use this credit card before next month's bill".
I heard from the customer service. I haven't used the bill before, but I cancelled it directly after the bill ~ Bank of Communications credit card is rubbish ~ Although it is a gold card, I did not hesitate to cancel it directly.