I'm in a similar situation, I have a personal account I've used for years and created a new account for my new business last week. Everything was accepted but this week I've been locked out, I had the same experience as you, went to forgot password, told I had to request access, and then received an email to say request denied. I called the support number that was on the email with my Apple Developer Program invoice and they recommended I submit a support request on developer.apple.com/contact/apple-id which I have now done.
Topic:
Developer Tools & Services
SubTopic:
Apple Developer Program