Hi,
It looks like you already had payment information associated with that account from a time when your Workspace was previously subscribed to Trello Premium, so when the free trial expired, it automatically continued the subscription with the payment information on file.
If you did not intend to keep Trello Premium, you can go to this page and select "Request a refund" as the topic:
https://www.atlassian.com/company/contact/purchasing-licensing?redirectSource=sac-wac-redirect#/?inquiry_category=your_account
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