Deterioration of my wow account

I Played wow classic until TBC last week, back then I forget my new email and password. Then I call a support officer to help me. I decided to change the email address to the original email. I just remember when I do first changes not until nowadays. Then when the officer helps me recover my account to the original email address. The account reverses to the time the character is still on a classic. I just did a raid on TBC last week. Just don’t know what happened, LOL