seeker

a made up word.
a euro cc Tld...
and a threat?

I am no lawyer, and I am sure you can get better advice, but unless they are big time players, in which case, I would check all neighbooring tlds to see who owns them...
in case they dont, you are probably being pushed around...
If you had just not replied with the offer, IMHO, you would have been clear.
as is, it really depends on the company.
Check for TMs etc...

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