Core Viewpoint - The article provides a comprehensive guide for consumers on various complaint channels, emphasizing the importance of choosing the right platform and preparing necessary documentation for effective dispute resolution [1][8]. Group 1: Complaint Channels - E-commerce, delivery, and ride-hailing platforms offer the quickest resolution through internal complaint mechanisms, allowing consumers to submit evidence directly in their order details for refunds within three to five business days [2]. - The 12315 National Consumer Rights Protection Platform serves as a formal and authoritative complaint channel, with cases assigned to local market supervision departments, although the process can take two to three weeks [3]. - Local consumer associations focus on mediation, contacting businesses to resolve complaints, but their effectiveness can vary based on the business's willingness to cooperate [4]. - Black Cat Complaints is a third-party platform known for its speed and transparency, with complaints typically reviewed and made public within 48 hours, allowing consumers to see business responses [5]. - The People's Daily Leadership Message Board serves as a local channel for complaints related to local enterprises or public services, although it may not be the fastest option [6]. Group 2: Importance of Documentation - Consumers often underestimate the importance of documentation when filing complaints. Essential materials include order and payment records, which establish the transaction relationship and are necessary for all complaint channels [7]. - For larger transactions, such as training or renovation services, contracts and promotional materials are crucial for confirming the seller's obligations and commitments [7]. - Communication records, such as chat screenshots, emails, or recordings, are vital for illustrating any delays or promises made by the seller, enhancing the strength of the complaint [7].