I need to retrieve my account but the ticket system isn't helping!

Ticket: #NIR-481-17186

I clearly stated that I do NOT remember my login id due to the fact that I haven't used it for too long (3-4 years)
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but I still have access to the email address associated with that account, but for some reason whenever I try to submit it gives me this error saying:

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(I also stated this fact in my ticket)

I also included some additional information about my account such as last password, approximate creation date, the secret question & answer and my birthdate

But I got this answer:
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I DON'T REMEMBER IT, THAT'S WHY I AM CONTACTING YOU!