1. If online payment is made, you may be prompted that the payment amount exceeds the payment limit, not that the credit card limit is insufficient. Credit card payment of each website will have a certain limit, ranging from several hundred to tens of thousands.

2. If you swipe your card at a physical merchant, it may be that you have multiple CCB credit cards under your name, thinking that credit lines are shared, and other cards have run out of credit lines, resulting in no extra credit lines available for this card.

If not, you'd better call the customer service hotline and ask the exact reason for not being able to pay.