you sure you got your username right? Even in worst case situation that someone managed to hack in your account, they can't "delete" your account so there is no way your username not accepted.
The only possible explanation I have with the details you gave is that you get your username and email wrong, and thus can't login or reset your password.
You can search for the username via the "Member" link on the top of the forum, and see if it's the correct one that you were trying to log in. If you're sure that the username was corrected, please tell us your username (here or through PM, whichever you prefer) so that we can help you further with it.
I did make sure my username was correct using both the way you just mentioned and seeing if I could create an account in that same name (which I couldn't cause it was taken)
Though I'm fine with that account the only thing that I'm mad about is that I was about to end G1 in HunT rank two alliance and was wondering could I get those tokens to this new account? I had no reds and only like 137 blues that don't mean to much.
My old username was momo12 (wishing I could've changed it)