I'm getting an error when I try to delete a theme. It says I deleted the theme but when I refresh the themes page it is still showing up.
You might have a permissions problem with your files. Can you login to your server via SFTP (or FTP)? You should then go to /wp-content/themes folder and find the theme you want to delete in its own folder. You can then delete it there if you have permissions, or change the files to give yourself ownership first and then do it.