A. 1. Look for a help or support section: Navigate to the Hacoo website or app and look for a 'Help', 'Support', or 'Contact Us' section where you can submit complaints. 2. Use social media: If no formal process is found, consider reaching out via Hacoo's social media channels, as many companies respond quickly to inquiries made publicly. 3. Document your complaint: Prepare a clear and concise description of your issue, including any relevant details, to ensure your complaint is understood.

B. 4. Check FAQs: Review the Frequently Asked Questions section on the Hacoo website, as it may provide guidance on how to submit complaints.