The credit card has been credited after the refund, but the bill has not been reduced. Because the refund can only be included in the next bill, it cannot be used as the current bill, so it has not been reduced when reading the current bill.

Billing day means that the issuing bank regularly collects and settles the current transactions and expenses of the cardholder's credit card account every month, and the billing day of the next period means that the bank collects and calculates the transactions and expenses of the cardholder in the next period.