Sorry to hear about that! Please visit support.atlassian.com/contact and select "Technical issues and bugs"
Then, select "Trello".
Then, type your question into the form for the AI chatbot. Note: it is not going to be able to help you. Trust me, just do it anyways.
Then, below that box, there is an option that says "Still need help? Raise a support request"
Click on that. Based on your description, I believe you need the Atlassian Support team to investigate if you believe an unauthorized person has accessed your account.
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