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No problem you don't speak Dutch. There are many forum members who speak English decently. What do you want to have? A 'factuur' (kind of receip) with the yearly cost for the Dal Voordeel subscription? Those should be visible under 'Mijn facturen'. If you are looking for an overview of travel transactions, please have a look at 'Mijn reishistorie (trein)'.
Later this day, an NS employee will come and read this topic. He/she might help you further!