A hacker accessed your battle net account.
A hacker accessed your battle net account.
Access your battle.net profile via their official site, review past transactions—any purchases made on your account will appear with proof and purchase dates.
Report the unauthorised activity to Blizzard and then ensure you are using the authenticator going forward. I know some people said enjoy the free games and that can be tempting, however you've no idea if they were bought with a stolen card / through fraud / drug money etc, and so using the games could impact you in the future.