If the credit card shows an invalid card, it may be that the credit card has expired and the credit card cannot be used anymore. The credit card is generally valid for 3 to 5 years, and different banks have different regulations. If it is not an issue with the validity period, users can call the credit card service hotline for consultation. Generally, customer service will give specific reasons and solutions.

Users must repay on time when using credit cards on a daily basis, and there must be no overdue repayment, because overdue repayment will generate penalty interest. The longer the time, the more penalty interest will be generated, and there are After overdue repayment, the bank will collect the debt until the user has paid off the credit card debt.

Overdue credit card repayments will also affect personal credit, and bad credit will affect various loan applications. Furthermore, when the credit card overdue amount is large and the time is long, the bank will sue the cardholder. After the court's decision, the user must return it on time, otherwise it will be enforced and the cardholder's property will be returned by selling off the cardholder's property.