In case of dispute, the user can appeal to the ADR entity. These entities are authorized to carry out the measurement, conciliation, and arbitration of consumer disputes in Portugal, and must be registered on the list of ADR entities, provided by Law No. 144/2015.
See more at: https://www.ipai.pt/
ODR - Online Dispute Resolution
You can use the European Online Dispute Resolution (ODR) platform, available at: https://ec.europa.eu/