If your return or exchange application is rejected by the seller, it is recommended that you first communicate with the seller to understand the reason for the rejection. If the seller's reason is unreasonable, you can complain to the platform's customer service, providing relevant evidence (such as product photos, chat records, etc.), and request the platform's intervention. The platform will make a decision based on the evidence provided by both parties and the platform policy. If the platform supports your claim, the seller will be required to process the return or exchange.