Account banned with no warning, no explanation. I´ve been a user since the GPT-3 beta

Welcome back! In this case I recommend you to contact OpenAI support either through Help or email them directly at support@openai.com and open a support ticket. In that you can include the email address on the affected account, your User ID and Org ID, whether you received a termination/deactivation email, that ChatGPT, Codex, subscription access and platform/org access were all affected, that you already submitted the appeal and replied to the termination email and any relevant screenshots, timestamps and billing/subscription details. Hopefully this will get resolved for you soon.