My friend's account has been banned for seven days since he commented on an altcoin giveaway without knowing that it goes against the rules. He now is aware of his mistake, and it won't happen again. By today, the seven (7) days are over, but he is still banned.

Profile link: https://bitcointalk.org/index.php?action=profile;u=3337887
Banned on: 27th August
Banned reason: commenting on an on-forum "ATA Lira" altcoin giveaway
Banned Duration: 7 days

Is there a way to recover his account or remove the ban?