First of all, super cool to hear that you've been such an early adopter of CodeSandbox! Not many can say that.

The fact that we made your projects public and kept charging is definitely a big mistake, and shouldn't have happened in the first place. When you cancel a subscription, we should keep your existing work private. Could you send me an email at ives@codesandbox.io so we can fix it?

Apologies for the fact this happened to you, that's a severe mistake and shouldn't have happened!