Hello @Seçkin
Welcome to the Atlassian community.
By "delete my account" do you mean you are trying to cancel your Atlassian Cloud product subscriptions? Or are you trying to delete the account/credentials that you use to login?
Canceling product subscriptions, deleting the site where they were installed, and deleting the Organization under which they exist takes time. A subscription that you have requested to be canceled will remain active until the next billing date in case you change your mind and want to withdraw your cancellation request. When the next billing date arrives the subscription will then be deactivated, but the data will be held for a period of time in case you change your mind and want to reactivate it and restore the data.
Deleting a site requires all product subscriptions be fully deleted.
Deleting an organization requires that all product subscriptions be fully deleted, plus some additional steps.
If you are concerned about the requests for your credit card information, you can reach out to the Atlassian Billing Team through the following page to find out if the message has been sent by Atlassian.
https://www.atlassian.com/company/contact/purchasing-licensing
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