I have a problem with a service provider and/or with a product that I purchased. Whom should I contact?

In consumers' relationships with suppliers of goods or service providers, issues raised are sometimes related to billing errors, breaches of contractual obligations, different interpretations of the scope and duration of contracts or compensation due to breaches of contracts, among others.
Complaints may be lodged on issues arising exclusively from the contractual relationship established between a consumer and the respective supplier of goods or services:

• With the sector regulators responsible for the markets at stake;
• With the DGC — Directorate-General for Consumers or  CNIACC — Arbitration Centre for Consumer Disputes:
• Directly with the Courts.