Once again, they do not want you to USE the email address. They want you to submit a support ticket (use Help/Support/Create Case on this website) and in your submission, TELL them what email address you used to create the account.
For example, in your ticket you might say...
"My account, user name SamSpade Resident, has been compromised and its password has been changed. The email address I registered when I created the account was firstname.lastname@example.org. I suspect the account was stolen by EvilExGirlfriend Resident."
If your ex managed to steal your account TWICE now, I would suspect that she has access to your computer. Save all of your critical information, then wipe your hard drive(s) clean, and reinstall Windows and all your apps. Change ALL your passwords.