Hi there, Celine from the Community Support team at Figma here. I'm sorry to hear about the confusion with your subscription.
I've gone ahead and created a support ticket on your behalf so our Support team can review your account and your request. For reference, your case number is #2006366, sent to your email address: hxxxxg2nxxxxw.co.xr. Please add in your support case, any additional details that may help with the review, such as the screenshots of the purchase confirmation you shared here.
Our support team will review your specific case, explain the available options, and determine what may be possible. Thanks for your patience!
Update: Good news -- The support agent has resolved your issue, please check your inbox when you can.
For your information, your team has also been reverted to the Starter plan, and you can subscribe again on monthly billing whenever you're ready. You can follow the steps here: Upgrade to a paid plan.
For further assistance, feel free to continue the conversation directly via your support case, I’ll go ahead and close the topic here, thank you!