Padmapper.com -- If you have bad credit, but have cash, you can offer more than just first and last to get around that typically.
I think this is very unfair...
When you get a message "you are banned, go away" by accident you can at least contact the admin and argue against it. Now you don't even know it happened.
(You're probably the 10th person I've contacted to let them know about a hellban.)