Hello! If you've waited 24 hours after buying the rank, and you have relogged, you can send an email to [email protected] using the instructions in this thread: https://mccentral.org/community/threads/donation-issues.136/. Note that some payment methods can take up to a week to process (explained in the link). An admin should respond and give your rank if you have paid. I hope this helps, have a great day!
