That's unfortunate.
Let’s go through the process together. First, make sure you enter the discount
code exactly as it appears (case sensitive) and check that the code is still
valid and has not expired. Second, check the terms and conditions of your code,
if the item is on sale or falls into a particular category, the discount may
not be valid for this product. If it still doesn't work, please send an email
to hallo@studeerpil.nl stating the code and our team can advise and contact
you further.