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From consumer to class action: when individual complaints create risks for companies.

February 19, 2026

In today's consumer relations landscape, seemingly isolated and minor complaints can escalate into significant legal challenges. Many companies still treat individual disputes as isolated incidents, but a lack of proper attention can lead to civil investigations and subsequent class action lawsuits, with substantial financial, operational, and reputational consequences. Properly resolving individual claims is not only good business practice but also an effective risk mitigation strategy.

The Brazilian consumer protection system, structured by the Consumer Protection Code (CDC), was designed to balance a naturally asymmetrical relationship. In addition to regulating individual rights, the CDC dedicates significant attention to collective protection, providing mechanisms aimed at protecting diffuse, collective, and homogeneous individual interests. Thus, practices that initially appear as isolated complaints may reveal structural flaws and justify collective action.

When consumers repeatedly report the same defect, improper charge, or questionable contractual clause, the issue may attract the attention of agencies such as Procon (Brazilian consumer protection agency) and, especially, the Public Prosecutor's Office. The latter has the legitimacy to initiate a civil inquiry, an extrajudicial investigative procedure aimed at investigating possible collective harm. At this stage, documents may be requested, interested parties may be heard, and Terms of Adjustment of Conduct (TAC) or Administrative Transactions (TA) may be entered into. These instruments allow for the voluntary adaptation of business conduct to legal requirements, establishing obligations, deadlines, and, potentially, compensation. When well-structured, these mechanisms function as important tools for consensual resolution, avoiding litigation and significantly reducing the company's exposure to a future Public Civil Action.

 

However, if no agreement is reached or if the irregularity persists, the situation may escalate to a Public Civil Action (ACP), as provided for by the Public Civil Action Law. The ACP is a procedural instrument of a collective nature intended to protect diffuse, collective, and homogeneous individual interests, widely used in consumer matters. Through it, it is possible to request the cessation of abusive practices, obtain the imposition of obligations to do or not to do something, declare the nullity of contractual clauses, and seek compensation for collective material and moral damages.

The effectiveness of collective actions in defending consumer rights is precisely what makes a preventive stance crucial for companies: when small conflicts are neglected, they can become the basis for structural demands that require not only redress, but lasting changes in internal processes and policies.

From a procedural perspective, class action lawsuits bring together elements that increase the risk for companies. The granting of preliminary injunctions, for example, can immediately impact the company's operational dynamics. The widespread dissemination of these lawsuits can also negatively affect its institutional reputation. Added to this is the fact that a class action ruling favorable to consumers can serve as grounds for future individual enforcement actions, considerably increasing the company's liabilities.

Therefore, the management of individual complaints should be viewed as part of a broader strategy for compliance and mitigation of legal risks. Periodic contract review, systematic monitoring of recurring complaints, preventive legal action, and immediate technical responses to conflicts, even seemingly minor ones, are not only good governance measures but also essential tools to prevent these conflicts from escalating into civil investigations and class action lawsuits.

In short, a single complaint can be the first sign of a deeper problem. By ignoring it or treating it superficially, the company opens the door for the conflict to escalate into formal oversight bodies and, eventually, into collective actions with broad and lasting effects.

If you have any questions about the topics covered in this publication, please contact any of the lawyers listed below or your usual Mazzucco&Mello contact.

Ivan Kubala

+55 11 3090-9195

Leonardo Neri Candido de Azevedo

+55 11 3090-9195

Rafael Mello

+55 11 3090-9195

Vitor Antony Ferrari

+55 11 3090-9195

This communication, which we believe may be of interest to our customers and friends of the company, is intended for general information only. It is not a complete analysis of the matters presented and should not be considered legal advice. In some jurisdictions, this may be considered lawyer advertising. Please see the company's privacy notice for more details.

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