It can always happen that something doesn't go exactly as planned. I advise you to first report any complaints to me by emailing info@sparklesonline.nl .
If this does not lead to a solution, it is possible to register your dispute for mediation via Stichting WebwinkelKeur, via https://www.webwinkelkeur.nl/kennisbank/consumenten/geschil ". From February 15, 2016, it is possible for consumers in the EU also allows you to register complaints via the European Commission's ODR platform. This ODR platform can be found at http://ec.europa.eu/odr . If your complaint is not yet being processed elsewhere, it will state you are free to file your complaint via the European Union platform."