1. Contact Tmall customer service: log in to Tmall account, find the "Contact Customer Service" button on the "My Taobao" page, contact Tmall customer service, explain the situation and apply for a refund. Customer service will assist you in handling the refund according to your situation.
2. Apply for a refund: on the order details page, find the relevant order, click the "Apply for a refund" button, fill in the relevant information such as the reason for the refund, and wait for the merchant to confirm the refund.