Supercell ID Email Changed Without Permission, Lost Access To Clash Accounts

My Clash Royale and Clash of Clans account, which I have invested 9 years of effort into, has been stolen. I can no longer log into any of my games linked to my Supercell ID. The email address of my long-used Supercell ID was changed without my permission on August 2. Login attempts show activity from Germany and the USA. Today, when I tried to log in, I received the warning: “No Supercell ID is registered with this email address,” and I can no longer access my account. My player ID is #289vlvyr, and there have been no payment transactions on my account.

I do not understand how my email address was changed without authorization, and I received no notification about this. I request that my account and my old email address be restored. I urgently ask for my grievance to be resolved.