Suspected cash withdrawal leads to freezing: frequent use of POS machines to withdraw large amounts of cash has caused UnionPay to doubt the credit of cardholders, and the bank will reduce the credit card limit, and if the circumstances are serious, it will directly freeze. At this time, it is necessary to provide relevant evidence of non-cash withdrawal to the bank, otherwise it will not be unfrozen.

Repeated overdue repayment: The solution is to repay in full, call customer service and ask for unfreezing. As a result, the credit limit may be reduced, but if there are not many overdue times, the general customer service will unfreeze it. If the amount is large and overdue for a long time, it cannot be unfrozen.

code set and code jump of the second clearing POS machine: At present, the market is flooded with second clearing machines, and the consumption records of credit cards are in a chaotic state because some of them use the big merchant model.