Not my steam account and this AC linked to my EA account

Hey there, 

If you don't recognize the email or any platforms linked to your account, I suggest that you re-secure the account. You can find instructions for that in the following article: What to do if your EA Account has been hacked

To unlink accounts, please see: Unlink your platform accounts from your EA Account

Should you need any assistance during these steps, please feel free to contact EA Help Support.