Hello,
We’re sorry to hear that you are facing issues accessing your purchase. If you have encountered an error with the email address during the purchase, please provide us with the correct email address associated with your purchase so we can assist you further.
Thank you for reaching out to us.
Sources:
Troubleshooting Payment Issues at Rank Math » Rank Math
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Hello,
Thank you for contacting Rank Math support.
Your account has an active Content AI plan. If you are not able to access the credits on your site, please navigate to WP Dashboard > Rank Math SEO > Dashboard > Help and disconnect & reconnect your Rank Math account.
After that, 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.
Hope that helps, and please do not hesitate to let us know if you need my assistance with anything else.
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.