Hi there! I understand you purchased the JoyLit unlimited reading card, but it's not working as truly unlimited for you. Let me help clarify and resolve this.

First, could you tell me a bit more about what’s happening? For example:
- Are you seeing a limit on the number of books you can read despite having the card?
- Is there an error message when trying to access certain books?
- Are you accessing JoyLit through the app on your iPhone with iOS 18.7?

Sometimes, JoyLit offers different types of cards—some may have usage limits or restrictions on certain content. There are also two ways to get content access: via book coins or reading cards. The "unlimited" reading card might have some fine print or conditions.

Here’s what I suggest as next steps:

1. Check your card details and balance: Open your JoyLit app, go to your profile or account section, and look for your reading card info. Confirm the card type and if there's a usage count or expiration.

2. Update the JoyLit app: Make sure your app is updated to the latest version (check the App Store), as sometimes issues get fixed in updates.

3. Review reading restrictions: Sometimes "unlimited" allows you to read from a curated library or specific categories. Check if certain books or genres are excluded.

4. Log out and log back in: This can refresh your account and sync your reading card status.

5. Try a simple test: Pick a book you haven't read yet within JoyLit and see if it opens fully with no payment prompt.

If after this the card still doesn’t work as expected, the issue might be specific to your account or a backend policy change. In that case, I can guide you on contacting JoyLit support directly for a refund or clarification.

Could you please let me know what you find in steps 1 and 5? That will help me help you better.