My Clash of Clans Account Stolen and Email Changed

My Clash of Clans account, which I've dedicated countless hours to over the past 4-5 years, has unfortunately been stolen, even though I had it securely linked to my Supercell ID. I just wanted to let you know that your account name has been updated. You should have received an email confirming that the email address associated with your Supercell ID account has been changed to j****@r****. Unfortunately, your previous email address is no longer valid for logging in.

Attached is a screenshot displaying the village that was unfortunately stolen, along with the altered account name. I kindly request your prompt assistance in resolving this matter.