How do I file a complaint about poor product performance?（如何对产品性能不佳提出投诉？）

You can submit a complaint through our official website's "Customer Feedback" section or contact our after-sales team via email/phone. We will investigate within 48 hours and provide a response.（您可以通过我们官网的 “客户反馈” 板块或通过邮件 / 电话联系我们的售后团队提出投诉。我们会在 48 小时内调查并给出答复。）