Hello,
Thank you for reaching out to us, and we apologize for the inconvenience you’ve experienced with Content AI.
We understand your frustration with the recommendations provided by Content AI. If you’re not satisfied with the results and would like a refund for the unused credits, please head over to WordPress Dashboard → Rank Math → General Settings → Content AI and refresh the credits. Here’s a screenshot for reference:

Once done, please go back to using Content AI and it should work without any issues. If you still find it unsatisfactory, please assign this ticket to a human agent using the available button, and we will assist you further with the refund process.
We appreciate your understanding and patience in this matter.
Sources:
How to Use Rank Math’s Content AI for SEO » Rank Math
This is an automated reply from Rank Math Support Bot. If you need further assistance, please reply to this topic and a human support agent will reply to you shortly.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.