When handling customer service issues or complaints related to AliExpress products, first acknowledge the customer's concerns and apologize for any inconvenience caused. Gather all relevant information about the issue, such as the order number, product details, and specific complaint. Contact the AliExpress supplier or customer support on behalf of your customer to address the issue and seek a resolution, such as a refund, replacement, or return. Keep your customer informed throughout the process and follow up to ensure their satisfaction. If the issue cannot be resolved satisfactorily, consider offering a goodwill gesture, such as a discount or bonus, to maintain a positive relationship with your audience. Remember to prioritize your customers' trust and satisfaction, as this will be key to your long-term success as an affiliate.