Yesterday, when I used the Bank of Communications card for the first time, the POS machine didn't issue a ticket, which showed that the transaction was rejected, and then I swiped it again successfull

Yesterday, when I used the Bank of Communications card for the first time, the POS machine didn't issue a ticket, which showed that the transaction was rejected, and then I swiped it again successfully, but the text message prompted me to deduct the money twice. The workflow of POS freezing bank card funds is->; Return to unionpay platform-> unionpay platform to organize funds. Sometimes the funds may be frozen, but the communication is interrupted and the funds are hung on the UnionPay platform. There are many such cases. Finally, the money will be refunded to the cardholder, but the refund time will not exceed 15 days. In other words, if it is not received within 15 days, the money will go to the merchant's account. You can call 955 16, choose the manual service to inquire, and provide the card number and consumption time, as well as the merchant number of the merchant (on the purchase order) to find out whether your money has arrived. The bank can only provide your statement, so it is useless.