Compare that to Amazon that will easily refund a purchase made 18 months earlier no questions asked.
I almost never buy from Amazon, but there's no denying I feel much safer ordering there than elsewhere. My last expensive non-Amazon purchase got me an opened box (either a return or plain used item). Even PayPal didn't care to do anything about it.
Hell even Apple has been fined by Italy for not properly disclosing that customers have 2 years warranty from the seller. I even had to tell customer service about it just last year, who acted like they didn't even know.
Law -> 14-day return policy, you pay for shipping, the shop will make it as difficult as possible to let you return the item (even if it's illegal), they don't have to take the item if you opened it (which makes no sense - how do I know I don't want it if I can't try it?)
Amazon has their chat, which replies immediately and you get your money back pretty easily.
That's just the usual experience of German customer service. The consumer is expected to quote the relevant paragraphs to explain customer service why they need to cover cost of return shipping or whatever and they will fight you every step of the way (or try to ignore you). It seems to be a cultural thing.
Edit: and what makes this so annoying is that I really want to be a nice guy for the customer service, not an asshole. And when they treat me like this, I turn into a monster and I'm not happy about it.