In the event of a dispute, the consumer may resort to an Alternative Dispute Resolution Body.

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

More information at Portal do Consumidor www.consumidor.gov.pt