Collect evidence: Make sure you have enough evidence to support your claim. Including purchase invoices, product manuals, advertisements and other related materials. In addition, you can use professional charging treasure testing instruments to test its capacity and record the test results.
Contact the merchant: first of all, you can contact the merchant, explain your problem and ask for a solution. Provide your evidence and ask for a refund or a reasonable solution. When communicating with merchants, be rational and objective, and ask for a written reply or record the conversation.
Channels of complaint and rights protection: If the merchants refuse to solve or cooperate, they can seek higher-level channels of complaint and rights protection. You can complain to consumer protection organizations, consumer associations or relevant regulatory authorities. Submit relevant evidence and explain your questions and requirements in detail.
Seek legal support: If your rights and interests are not properly safeguarded, you can consult a lawyer and consider taking legal action. Lawyers can help you assess the situation and provide advice and support according to relevant laws and regulations.