Hi, @Gioconda Lab. Thanks for your post and apologies for replying in English - I don’t speak Portuguese.
Did you see the response to your ticket from our support team? It looks like they took care of the refund for you, so you can now upgrade again to the monthly plan instead of the annual plan. While we can’t assist with billing and account-specific issues like that here, let me know if you have any other questions regarding using Figma! Happy to help.