How to report a player for cheating in Diablo III
How to block communication from another player in Diablo III.
Player reports they had heroes they use to play in Diablo III and they're now missing.
BattleTagまたはReal IDフレンド・リストのロードに関する問題のトラブルシューティング
These errors can be caused by temporary server issues in a specific region.
This article explains the process of speaking to a Game Master (GM).