[2023] Account Rollback.

It sounds like you're saying your friend went onto your computer after he got mad. That can happen if your login is saved. You might want to disable that or password protect your computer to prevent future situations.

-

As to the CS Ticket, you can use this link: https://na.wargaming.net/support/en/products/wows/help/31417/31422/31444/

Please explain the situation and that you are ok with a rollback to reverse the damage that was done.