Theoretically it should be 1000. But in fact, how much money should be paid back can not be calculated by subtracting the available amount. It should be to directly check the balance in the card. If the balance is 1000, it means that it is really necessary to pay back 1000 yuan. Because the amount in it may also be authorized to freeze, or it may be occupied by applying for installment payment. You don't have to return it now. Or you can wait until the bill is settled and directly see how much bill you should pay this month.