Hello,
Thank you for your query and we are so sorry about the trouble this must have caused.
It seems like you purchased the plugin with some other email address. [moved to sensitive data section]
Please install or update your Rank Math Plugin to the latest version: https://rankmath.com/changelog/
You can disconnect your account by navigating to WordPress Dashboard > Rank Math > Dashboard > Help
and then simply disconnect the account by clicking on Disconnect Account.
Once you’ve disconnected your Rank Math account, you can connect it again in the same settings. In order to connect your correct account, click on Connect Now.
Once you click on Connect Now, please ensure that you’ve selected the correct account and then click on OK, Activate Now, as shown below.
Then 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.