?
Have you attempted to get it repaired by a third party? What do they quote? Is it possible that the part + labor is worth around $680? It does sound like an absurd price, but I would expect the display to be a relatively expensive part (a replacement is $600 at iFixit[0]) to replace depending on the extent of the damage. It might also be labor intensive considering how unrepairable Apple products are.
> I still need to pay 50 EUR to get the computer back.
Presumably this is for shipping? $50 is expensive sure (unless you're talking expedited shipping), but I suspect you'd be mad even if this was a more reasonable price.
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It sounds like you're just being vindictive because you feel slighted by a company. If you actually want a solution it seems that tomorrow you can buy the part yourself and replace it.
[0]: https://www.ifixit.com/Store/Mac/MacBook-Pro-14-Inch-2021-A2...