Is the balance -50, or the available limit -50?

If the balance is -50, it means there is no repayment amount recorded on the card. A negative number means overpayment, which means an extra 50 is deposited.

If the available limit is -50, it is very likely that you have more than one CCB credit card in your name, and all the other CCB credit card limits in your name have been used up, and exceeded 50 yuan, because the limit in your name is No matter how many CCB credit cards you apply for, the limit is exclusive. If the limit of other cards exceeds the limit, the available limit displayed on the new card will also become a negative number.