A customer from Germany ordered 10 sets of non-wrinkle filters. The product size was quite large and the shipping required wooden boxes. Due to the excessive size of the packaging, customs procedures needed to be completed locally and then the goods would be delivered to the designated place by the logistics vehicle. During this process, due to incomplete tracking of the logistics information, the customer mistakenly believed that we had not shipped the goods and applied for a refund. After numerous patient communications, tracking of the goods' whereabouts, and constant attention to the shipping status of the goods, along with sending the shipping packaging and real videos and materials from our factory, the customer's doubts were alleviated. When the customer received the goods, they immediately sent a compliment message, stating that our products exceeded their expectations and our service was very satisfactory. After the trial use, he and his friends would cooperate with me and gained his complete trust.