[Issue] My steam account is already linked to a swtor account

Product: Star Wars: The Old Republic
Platform:Steam-PC
What is your Star Wars: The Old Republic Display Name? (optional)
What is the AMD or Nvidia Model Number of your graphics card?
What time did this happen? Please include the timezone. Everytime
What class were you playing? Sith Juggernaut / Jedi Guardian
What role were you playing? Tank
How often does the bug occur? Every time (100%)
What happens when the bug occurs? I started the game from Steam. I enter my username and password except that it puts me "We can't log you in. Please double-check you're using the Steam account you usually play on and try again".
What do you expect to see? Nothing.
Steps: How can we find the bug ourselves? I don't know.

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I started the game from Steam. I enter my username and password except that it puts me "We can't log you in. Please double-check you're using the Steam account you usually play on and try again".

Problem is, I don't remember that account. I do not remember the name and the email address of the account has been deleted many years ago. I looked on steam and on the game forum but I did not find a solution.

I was advised to contact support by phone except that they cannot help me because I don't have any information related to the account to prove that it belongs to me. So I asked if they could see to which star wars the old republic account my steam account is related but they told me that it is not possible.