The objective of this study is to analyze the reaction and the action of restaurants when consumers makes fraudulent complaint. In the last stage of the decision process, the post-purchase behavior, it is when satisfaction, actions and use/disposal of the product occurs. If a product does not reach the expected performance by the consumer, he will be unsatisfied and will adopt some action, such as the complaint. However, there are complaints that are not from dissatisfaction, fraudulent complaint. Was conducted interviews with employees and restaurant owners to identify how they deal with such complaints. The main result of the research is that the most frequent false claims are salty food, food without seasoning, cold food, hair, animals, food with bad taste / damaged or small amounts of food. The actions taken by the restaurants in these situations are: exchange of course, offer dessert, offer discount or remove the item of the account.