eFootball Konami ID Email Changed Without Permission and Account Lost

I play eFootball on mobile and my game account is linked to a Konami ID. About one month ago, the email address linked to my Konami ID and in‑game account was changed without my consent. Since that change, I have lost access to my account and I am unable to use the original email I registered with. I contacted Konami support and today I was informed that the email is not registered anymore because it has been changed, and that it cannot be restored. This means I currently have no way to access or secure my account, even though I am the original owner and did not authorize any change of email. I request that my original email address be restored to my Konami ID and eFootball account, or that another secure solution be provided so that I can recover full access to my account.