The trial period is expired for project which I create only for practice. I create only the title of project and nothing else. Now my inbox is full of requests from Atlassian for payment.
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Go to your site admin and shut down / delete all the trial services you have signed up for.
Then go to id.atlassian.com, log in with the account you used to create the trials, and find the "delete account" under profile -> account settings -> account preferences
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