Steam Sales - Purchasing and billing FAQ
If you need help with a purchase issue, contact Steam Support and select the following options:
https://steamhost.cn/help_steampowered_com/en/faqs/view/4C10-B32A-137D-0945#other

Oprindeligt skrevet af PollaroiD:

please help me!!!!! i didnt make any purchases in dota 2 but in my purchases history i made purchases and spent around 7,000 yen

Sounds like someone has access to your account.

Do all the following steps to properly secure your account.

Scan for malware https://www.malwarebytes.com/

Deauthorize all other devices https://steamhost.cn/twofactor/manage

Change passwords from a clean computer

Revoke the API key https://steamhost.cn/steamcommunity_com/dev/apikey

Generate new backup codes