It really depends, on the ban that occurred on your account.  If you are only a normal user (unverified – acceptance of tokens) you can only email support@chaturbate.com

The best way to have an idea of why you have been banned is to look through the Terms and Conditions of the site: Click here LINK or look at the extra rules in the help section: Click here LINK

You can also look through this tumblr to see more rules that have been discovered.