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Condolences on this nonsense. Sounds like that company's actions are also causing anguish, and I hope a nice bulldog lawyer can help with that facet of the situation.

Well, logically you should be able to keep the old name because you have documented proof that your user base in EU is small enough that this should NOT cause any confusions between your name and the new trademark holder. Just keep the cancellation documents as proof that you use this name but not in EU. This is their claim and not yours, right? The other possibility is that if you have enough users in EU you should also keep the trademark. Only one of these can be true?

Also note that I already lost some court cases using my logic.

I think you should be as annoying as possible within the confines of the law. No reason to make it easy for them.