Aurora, I feel your plight and I’m glad you were not banned along with your clanmates. The admins do not take this sort of action unless there is indisputable proof of wrongdoing. Although I have no knowledge of the clan’s actions, it actually amazes me that someone in Funcom took the time to verify you were not involved. Were I you, that would seem to be a compliment.
As to an official response, may I suggest you ask for that in a direct message also? It may get more attention from the people you want to hear from. You can get a list of those people, with their DM address, by clicking the Dev Tracker at the top of the main page and the clicking “members (58)”. It also includes their title so you can direct the massage as you want to.
Personally, I would concentrate on what I wanted fixed, rather that ask for a specific reason for the actions they took. The former will get you a better response; the latter may be prohibited internally, since it may have involved an exploit.
Good luck !