eFootball Account Lost After August 31 — Request for Account Recovery

I have been playing Konami’s eFootball using my account regularly, and I last accessed it on 31 August. After that date, I suddenly could no longer log in to my account and it appears to be lost. When I try to access my eFootball account now, I am unable to log in, and I have no way to reach my existing data or progress. There was no clear explanation, warning or notification sent to me about any problem with my account, so I do not understand why I lost access. On this account I had also spent money inside the game, with a total of around 4 dollars in in‑game purchases. Losing the account means I also lose the benefit of this amount and the time I invested in the game. I kindly request that my eFootball account be found and restored, together with all my in‑game progress and purchases, or that an appropriate compensation be provided if recovery is not possible. I also ask for clear information about the reason for this issue and how it can be prevented in the future.