In the event of a dispute, the consumer may refer the matter 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 available at the Consumer Portal: www.consumidor.gov.pt