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Then how did someone get your secret account name, your secret password and physical access to your phone to access your Steam Mobile Authenticator?
Check websites before you give them your login details would have helped. That's something you should do for any site, whether it's http or https, if you will be entering confidential information. Can use sites like this
https://www.scamadviser.com/
scan for malware https://www.malwarebytes.com/
deauthorize all devices https://store.steampowered.com/twofactor/manage
revoke any api key https://steamcommunity.com/dev/apikey
change your password on a clean computer.
generate new back up codes https://store.steampowered.com/twofactor/manage
unfriend/report/block the account(s) that are involved in this mess.
until you really secure your account again, that "hacker" might still be able to access it.
you might also want to think about getting a decent security software.
one more thing to consider, your account might have been used to send phishing links to your friends, and they unfriended/reported/blocked your account because of that. that might also explain why the Steam Support can't restore your friends list...
https://steamcommunity.com/discussions/forum/1/492378806385644508/#c492378806386027594