HI @Josef Banya
Generally speaking, this is non-refundable. Once you pay for a years subscription for a member, you can't get it back. What you get instead is a license that can be reassigned to someone else.
Looking through the terms and conditions, there is the possibility of refund within the first 30 days:
https://support.atlassian.com/subscriptions-and-billing/docs/request-a-refund/
I presume you can request the refund by contacting Trello here:
For future, take a look at this guide here to be sure of how Trello billing works:
https://support.atlassian.com/trello/docs/how-billing-works-with-trello-premium-and-standard/
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