In the event of a 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-list-of-entities.aspx

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