Account restore

Summary:lost access to my account and could not receive emails from oracle

Content (please ensure you mask any confidential information):

someone used my laptop,deleted my username and add his new username in my account,I don’t reiceve password reset mail anymore .what should I do to restore my account to original.i am using a free tier

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

Oracle cloud free tier

Code Snippet (add any code snippets that support your topic, if applicable):