You are not baned for campaigns you are banned from the forum. This includes all your accounts.
Yeah your only that account is banned from the forum but shorena i dont think all accounts are banned.. Actually i also went throught that kinda ban

but i still was able to log in from my alternate that i had created way back earlier
All your accounts are banned when one is. Just because the admins might miss your alts doesn't mean they're ok to post from. You're lucky you didn't have your ban extended or worse. Many users get perma banned for evading their bans.
I just checked my account, it's still 2 weeks, and it will expire in a day. I only needed this account to finish some deals I started, that's why I was posting in Services and project Development