"Balance" refers to the amount owed by the landlord. If it is negative, it means outstanding debts (such as unauthorized transactions, installment transactions, pre-authorized transactions, etc. ) have been removed, and there is still a balance of 263 yuan in the landlord's card.

"Available quota" refers to the quota that the landlord can use. Now it's 500 yuan. The landlord subtracts the available line from the credit line, which is the line amount that the landlord has used.

One thing is certain, the landlord has already paid 400 yuan back, and the balance is negative when it arrives, so the bill that has been issued in the latest issue should be paid back. As for the unpaid bills, it should be combined with the landlord's credit line, whether there are other credit cards of CCB and the specific transaction situation. Judging from these data, it is not clear.

It is suggested that the landlord can explain it in a little detail when asking questions, which is convenient for judgment.