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