Donor kits are higher then the commander kit, so the premium prefix took over your commander kit prefix. Are you sure you want the command prefix back?
@sjurdur034571 you can reply to messages using the 'reply' button in the bottom right corner. You can contact Mineverse, and you have to wait at least 3 or 4 days. Hope you get your prefix back.
You did not lost commander, since Premium is higher than Commander, you get the Premium tag. You might still be able to use /kit Commander.
I believe Elite and up gets commander anyway. I'm a titan, and when I bought Elite I got commander automatically.