Information on the Diablo III starter edition. 

This error may happen when something interferes with the uninstall process.

Information on error BLZHROPAY10200252

Information on error BLZSC2PAY10200252

Information on unlooted items and The Postmaster.

Troubleshooting steps for resolving payment error in Heroes of the Storm.

Troubleshooting steps for resolving payment error in StarCraft II.

「無料体験版の最大レベルに達しました」というエラーが原因でSteam Diablo IVキャラクターにログインできない場合の対処方法

You might be in a raid group! We also have some other steps to fix this issue.

This article explains the process of speaking to a Game Master (GM).