If the credit card repayment system is busy, you can wait for a few minutes before operating, or you can contact the credit card customer service for repayment. According to the relevant public information, if the credit card repayment system is busy, you can go to the bank counter for repayment first. The bank counter generally has a long queue, but it can effectively solve the repayment problem. Or wait a few minutes for the system to stabilize before operating for repayment.