If the card was swiped after the 19th of last month, the money you paid back will not be credited to your account until the 7th of next month, so the limit is only more than 400, and the 3,500 is considered your overpayment. , you can withdraw it at the cash machine, or you can continue to swipe. If the swipe is less than 3500, your 400 limit will remain unchanged