I can't login my own Oracle Cloud (Always Free)

Summary:

I was stolen my Oracle Cloud Always Free Account.

I received some emails.

First received email was written your password was changed.

Second received email was written your default email was changed.

I didn't checked this email account often.

When I couldn't login my account, I tried reset my password, but I can't received any email.

I was set 2 FA my using Google Authenticator. I don't understand how I got to this situation.

How can I solve this problem.

Content (please ensure you mask any confidential information):

Tenent : changkiibm / First registed email address : changki.ibm@gmail.com

Version (include the version you are using, if applicable):