My credit card, bank account or PayPal has a charge from Blizzard that I don't recognize.

The Blizzard End User License Agreement explains what you may and may not do with a Blizzard account. This article highlights a few passages from the EULA that are most relevant to this policy.

Troubleshooting problems charging your Blizzard Balance

Information about common payment issues and troubleshooting steps

Instructions to check the status of an order placed on the Blizzard Shop

How to pay for World of Warcraft game-time in your local currency

General information on setting up, maintaining, or canceling a subscription to World of Warcraft.

How to unlock a boosted character that was locked after a Battle for Azeroth chargeback

Information on Blizzard Phone Notifications

Information about this issue