dodo

If your Steam Wallet codes were used without your permission, you can’t see exact usage times yourself but you can contact Steam Support and give them the code numbers. They can check when and where the codes were redeemed. If the codes were bought from a store, having the receipts will also help your case.

вап

Flingo say it all, just ask the support in the support center :
You'll need to sign in but you can do it in a Browser like in Safari or on your phone using the app :
https://steamhost.cn/help_steampowered_com/
For the English website : https://steamhost.cn/help_steampowered_com/en/

Hope you get back your cards,
WiBlum