In the event of a dispute, the consumer may have recourse to an Alternative 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-list-of-entities.aspx

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