Hi there! Our apologies for the inconvenience, however, we cannot view history of an account's previous information. So if someone was able to sign into your account and change your email address, we can't verify you as the owner as we have no visibility into what the original email was.
For security reasons, to be able to assist with any account sign-in, we need a full verification of the username, email address, and any other information that may be available to us.
If you are able to provide the information such as username, date account was created, and any other that may still be available, please head over to our live chat support for further assistance.