Full guide:
This is a list of why your account could be banned or suspended. Please try to log on your account, and see the number in the message you get. Then locate that number and read what it says here:
(0) Offensive account name.
(1) Advertising an inappropriate website.
Inappropriate websites may include sites that promote or provide game hacks, programs with embedded virus code, pornography, or other destructive or intrusive materials that are not appropriate on Battle.net.
(2) Spamming in a channel.
Please be advised that Blizzard Entertainment has an aggressive stance against any account that is used to spam a Battle.net chat channel. Spamming a Battle.net channel disrupts the normal flow of dialog in the chat room and violates the Battle.net Terms ofUse Agreement and/or End User License Agreement of the game.
(3) Stealing other player's passwords
(4) Attempting to obtain CD-Keys.
Please be advised that Blizzard Entertainment has an aggressive, zero-tolerance stance against any account being used by someone to obtain or steal CD-Keys or to con or trick users into giving out their CD-Keys on Battle.net. This offense violates the Battle.net Terms of Use Agreement and/or End User License Agreement of the game.
(5) Harassment of other users.
Please be advised that Blizzard Entertainment does not support or condone the use of any account to harass or threaten other users on Battle.net. This offense violates the Battle.net Terms of Use Agreement and/or End User License Agreement of the game. Harassment may result in the closure of the account or even the temporary or permanent banning of the associated CD-Key.
(6) Inappropriate use of a bot.
Blizzard Entertainment does not tolerate bots spamming chat channels or the use of bots to congest channels, which disrupts the normal flow of dialog. This directly violates the Battle.net Terms of Use Agreement and/or End User License Agreement of the game.
(7) Offensive or racist comments.
While Battle.net is a mature environment, we will close accounts that are used to violate the Battle.net Terms of Use Agreement and/or End User License Agreement of the game. We firmly believe that Battle.net's strength lies in its community, and racist or extremely offensive comments are not tolerated.
(8 ) This account was detected using a third-party program (hack) with one of our games on Battle.net.
This account is now permanently banned. Any third-party program that is designed to affect the way the user interacts with Battle.net is considered a hack program. This includes seemingly harmless third-party utilities that work with the game to provide functions that were not included by the game designers. While many of these utilities might not have been created to disrupt the balance of the game, they alter the original design of the program. The detection of any such program by Battle.net may result in the closure of the user's account or even the temporary or permanent banning of the associated CD-Key.
(9) Impersonating a Blizzard representative.
Please be advised that Blizzard Entertainment has an aggressive, zero-tolerance stance against any account used in an attempt to impersonate a Blizzard or Battle.net representative. This offense violates the Battle.net Terms of Use Agreement and/or End User License Agreement of the game.
(10) Inappropriate Activities (such as lossbotting, forum abuse, etc).
(11) The minimum age to play on Battle.net is 13.
Your account has been temporarily suspended. Please either email us at support@blizzard.com or call us at 949-955-1382 for further information. You will need to fax in a form signed by your parent or guardian giving permission to play on Battle.net.