In case of dispute, the consumer can resort to an Alternative Consumer Dispute Resolution Entity.

You can consult the list of entities here https://www.consumidor.gov.pt/parceiros/sistema-de-defesa-do-consumidor/entidades-de-resolucao-alternativa-de-litigios-de-consumo/ral-mapa-e-lista-de-entidades.aspx

More information at the Consumer Portal www.consumidor.gov.pt