Hey @Pauli_001, welcome to Figma Forum. Sorry to hear about the trouble with cancelling this subscription. I’ll go ahead and get this in front of a person who can resolve it as soon as possible.
I couldn't find a support request under the email tied to your Figma Forum account, so I opened a new case for you. Your new ticket number is: 2087570, and Customer Support will follow up directly to verify your account and look into the access issue. With the original account email no longer reachable, they'll also confirm the best address to contact you.
While the team works to get this sorted out, this article covers how email changes work: Manage email address or password.
Appreciate your patience as we follow up.