Whoever is responsible should bear the round-trip shipping costs! The seller is responsible for the round-trip shipping costs if there are product quality issues or the wrong product is shipped. If the seller refuses to accept the courier, you can complain to the seller! You can pay for it yourself first, and then complain to the seller after the seller signs for it and refunds the money, and ask for compensation for the shipping costs. Just try not to admit that you paid for the shipping costs in the chat records. Do not choose "other" as the reason, but choose "product mismatch" or "quality issues", otherwise the store manager will not support the buyer's application.