Call Of Duty Mobile Account Hacked - Unauthorized Email Change, No Access

I have been unable to access my Call of Duty: Mobile account since 31 December, and this problem is still continuing. I play on iOS phone and iPad, and I log in with my Activision account. Although Facebook and Apple login options appear, they are not usable, so I can only use my Activision login. One day I received an email about an email address change on my account, but this change was not made by me. After that, I lost access to my account. Following this unauthorized email change, I contacted Activision support many times through different channels and explained that I could not log in and that my account had been changed without my permission. Despite all my attempts and even reaching out through my backup in‑game account, I did not receive any effective support or solution, and my problem still continues. I expect my Call of Duty: Mobile account to be fully recovered and the unauthorized email change to be reversed so that I can safely access my original account again. I request that my account be restored as soon as possible and that all my in‑game progress and data be preserved.