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https://help.steampowered.com/en/
Do a virus scan.
Check that the email and phone number on the steam account are still yours.
Deauthorize all devices https://store.steampowered.com/twofactor/manage
Change your password on a secure device.
Generate new back up codes. https://store.steampowered.com/twofactor/manage
Revoke the api key https://steamcommunity.com/dev/apikey
Or the "other person" who is on your account closing the tickets, also was the one who did something that caused the ban.
Because the words "add me for trade" is viewed as a possible scam attempt.
Your other account may be compromised.
Do all the following to secure your account then re-contact Steam Support.
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 at https://steamcommunity.com/dev/apikey (there should be NOTHING in the APIKEY)
Secure your account, then try again.