Account stolen

My gmail account is stolen for what i have all evidence and lot of screenshots. Someone use my account and then quickly change password and recovery mail adress. After that i can't login in. I have excatly time and date when i was last used this acc. Biggest problem is that i have played online game where i have make some purchase for what i have all documents (official bank documents), but when i try to make recovery mail then show me that this account is deleted, but my game account what is maked and opened with this mail is still in function. What can I do?