We advise you to first make complaints known to us by sending an email to firstname.lastname@example.org.
If this does not lead to a solution, it is possible to register your dispute for mediation through Stichting WebwinkelKeur.
As of February 15, 2016, it is also possible for consumers in the EU to register complaints via the ODR platform of the European Commission. This ODR platform can be found at https://ec.europa.eu/consumers/odr.
If your complaint is not yet being handled elsewhere then you are free to file your complaint via the platform of the European Union.