I got a cash refund on the spot after shopping in Italian duty-free shops, but I need to use a credit card to authorize the mortgage. At the airport leaving the country, the tax refund form will be sent to the mailbox set up at the airport by mail. Within one month after returning to China afterwards, I received the debit notice from the original authorized credit card because the tax refund unit did not receive my tax refund form. No way, I can only accept the tax refund deduction and the corresponding fine, because I have not proved it either. More than a month later, I received a refund for the last deduction in my credit card. According to this speculation, it may be because when I left the German airport, the tax exemption form was delivered in the special mailbox of the German airport, while when I was shopping in Italy, the delivery time between the two documents was longer, which led to the situation that I was fined first and then returned to me. This matter was specifically asked to the domestic credit card units, and they could not answer or solve it. It seems that we can only wait passively. In the future, it's best to collect the tax refund cash directly at the airport tax refund point, and there is no subsequent trouble.