Hello,
We apologize for the inconvenience you are facing with your subscription not reflecting the double purchase.
Regarding your concern about purchasing the subscription twice, please note that you cannot purchase the Content AI plan twice and stack credits. Each purchase of the Content AI plan provides a specific number of credits based on your subscription level. If you need additional credits, you can purchase them separately from the pricing section on the Rank Math website.
If you have any further questions or need assistance, please feel free to let us know by replying to this ticket. We are here to help you.
Thank you for reaching out.
Sources:
How to Cancel Your Rank Math Subscription » Rank Math
Hello,
Thank you for contacting us and sorry for any inconvenience that this issue might have caused.
We can see a Rank Math PRO subscription on this account you opened this ticket with:

The PRO version is built on top of the free version to keep the plugins robust and lightweight. You will need both of them to be installed and activated at the same time so the PRO version will work. Kindly go to https://rankmath.com/my-account/ and download, install, and activate the PRO version in addition to the Basic version if you have not done that.
We have a detailed article on how to upgrade your account to PRO on your WordPress website:
https://rankmath.com/kb/how-to-upgrade-to-rank-math-pro/
You can also find more information on how Rank Math Free and PRO plugins work together on your website:
https://rankmath.com/kb/should-i-delete-free-plugin-after-upgrading/
Hope this helps and please don’t hesitate to let us know if you have any other questions.
Thanks.
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.