However I took a look at the customs office's website and it seems like you can get a "refund" on your import fees if you return a product you've bought from outside the EU. Would it be a lot wiser to simply return it? I'll have to call the customs office tomorrow and ask how to apply for a refund as well of course.
Edit: Perhaps I should add: For those of you who have returned faulty items to eBay sellers, how have your experiences been? Does eBay have any official support for returning items?