Hello! Could you cancel your free premium subscription now?
If you have not provided any payment information, you may not cancel the trial, but you also won't be charged when the trial ends, If that's not your case, you can try contacting Atlassian here:
support.atlassian.com/contact
Some options on that page will not allow you to contact them directly, so make sure you experiment with an option that allows you to submit a ticket.
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