Not every provider "recycles" email addresses of expired accounts. So it may very well be that your account is indeed expired and no longer existing, but that the username is not made available for new registrations. That could be an explanation for your issue.
What surprises me here is that even by telephone they are unreachable.
I would classify GMX as a well-known provider, although there seems to be a distinction between GMX in the German-speaking countries (gmx.de, gmx.at, gmx.ch) and GMX in the rest of the world. Apparently the version in the German-speaking countries is different, and very reliable. I never used GMX myself but I've met many Germans who do, and who are very satisfied. But it is apparently not the same service as the international one.
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