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Stop logging into untrusted 3rd party sites
and make sure you did everything
1. Scan for malware https://www.malwarebytes.com/
2. Deauthorize all other devices https://store.steampowered.com/twofactor/manage
3. Change passwords from a clean computer
4. Generate new backup codes for your Mobile App https://store.steampowered.com/twofactor/manage
5. Revoke the API key https://steamcommunity.com/dev/apikey (there should be nothing in the APIKEY)
Also be sure to disconnect all devices under settings from a secure device. Yes this will mean that you'll have to log in again on all devices you currently use steam on but that also means that any potential hijacker will be logged out.
Also make sure the password change is from a clean secure device, you might want to inniate a anti virus scan
What do you mean lost your prime status? That's not possible as far as i know
Weird. Try contacting support.