Live Chat with Chegg Agentshttp://www.chegg.com/contactus/
Click "Click here to request a refund" where the site mentions, then "already retuned your book but got charged a late fee" in bold blue. Click the link, click chat on the next screen then choose your topic to chat about.
Current Wait: 31 mins (avg 20)
Hours: Mon-Fri 9am-8pm EST