Hello Kropong,
Thank you for contacting Steam Support.
We have found activity in the Steam account related to fraudulent credit card use.
Per the Steam Subscriber Agreement, we have locked the account permanently. The account will not be reactivated.
The Steam Subscriber Agreement can be found at:
http://store.steampowered.com/subscriber_agreement/
In addition to violation of contract, said activities on the account may violate state and federal law. Valve reserves the right to refer the matter to the appropriate authorities.