If your email and password are changed on the account then there is no way to recover the account. This company has a very strict policy with recovering accounts and if anything is different then you cannot recover the account. You must have the original email or phone number on the account.
The issue in GetHuman-jabarisi's own words
I was sent a link from an account that seemed to be advertising something for CS:GO, and the website looked like any other CS:GO site would. Once I clicked the link, a typical "Sign in through Steam" box popped up, and I entered my credentials without much thought. Afterwards, I was logged out of my mobile authenticator, and my contact email was changed. I looked into it, and the changes were made from an IP address from Russia. The new email ends in "mail.ru".
GetHuman-jabarisi did not yet indicate what Steam Software should do to make this right.
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