In the event of a dispute or conflict, the consumer may resort to Alternative Consumer Dispute Resolution (commonly known as ADR), which covers mediation, conciliation and arbitration.
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 -and-entity-list.aspx

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