Hello,
We apologize for the issues you are facing with updating your payment method and the invoice details.
Updating Payment Method
For the payment method update, please ensure that you are entering the correct email associated with your Rank Math account. If you are not receiving any emails, it might be worth checking your spam or junk folder. If the issue persists, please reply to this ticket, and a human agent will assist you further.
Invoice Details
Regarding your invoice details, to update them, you will need to contact our reseller, FastSpring Consumer Support. You can do this by visiting their Consumer Support Page and selecting Billing Information as the topic and Billing Info Update in the Category. Here’s how the page looks:

Fill in the required details and submit your request. If you have any further questions or need assistance, please reply to this ticket, and a human agent will take over and help you out.
Thank you for raising these concerns, and we appreciate your patience as we work to resolve them!
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.