Useful. Is it useful for CITIC Credit Card not to activate 480 yuan annual fee? Black Cat Complaint is a consumer service platform under Sina. Users can complain about the irregular behavior of merchants through this platform, and there is also a list of corporate reputation to help consumers choose their consumption behavior. Many people have consumption disputes in the same lawsuit. After one person initiates a collective complaint, others can quickly participate according to the content filled in by the sponsor, which simplifies the complaint process of consumers and provides a channel and platform for mutual assistance.