It really breaks my heart to hear that! My friend just got frozen for apparently buying/selling NP's, items or pets. She's been on for several years, has worked very hard at her account and is even a premium member. She didn't even know it was possible to sell Neo-things for real money! She's sent emails too and hasn't heard anything back yet.
Please keep trying, because like others have said: It is possible to unfreeze your account. I wouldn't want to start over again either, so the best thing you can do is fight for your account!
Good luck