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thanks for the question.
the name you selected appears to be totally different than the one they are using and their demand seems to be outrageous on its face. i am assuming there is nothing else going on here.
on top of the foregoing, they can not prevent people from using a common word such as creative and i would be of the opinion that they have no claim and you should withstand their demands.
when speaking to them you might weant to take the position that you, too, will take whatever steps are necessary and in so doing you may want to get your attorney on board to perhaps write a stern lawyers letter and otherwise let them know you are serious.