Core Viewpoint - Consumers can effectively protect their rights through various complaint channels when facing issues with companies, ensuring timely responses and resolutions [1][15]. Group 1: Complaint Channels - **In-App Customer Service**: The fastest and most direct method for resolving issues within specific apps or platforms, such as e-commerce, food delivery, and travel services [3][4]. - **National 12315 Platform**: The most authoritative official complaint channel, suitable for serious issues like product quality problems and false advertising [5][6]. - **Industry Regulatory Hotlines**: Specialized hotlines for specific industries, providing higher efficiency in handling complaints related to telecommunications, transportation, and product quality [7][8]. Group 2: Alternative Complaint Platforms - **Black Cat Complaints**: A social platform that offers transparency and quick feedback, ideal for unresolved issues with companies [9][10]. - **Consumer Associations**: A more gentle mediation approach for disputes that can be resolved through communication, such as service attitude disagreements [12][13]. - **Legal Recourse**: The last resort for serious issues involving fraud or significant financial loss, allowing consumers to seek legal assistance [14]. Group 3: Summary of Complaint Process - The complaint process is straightforward, with a recommended order of channels to follow: In-App Customer Service → Platform After-Sales Intervention → Industry Hotline (if applicable) → 12315 → Black Cat Complaints → Consumer Association/Legal Action [15][16].