nathanrobjohn on "shortcode contact form sending form but not showing errors"

I have made a wordpress shortcode for a contact form, my form displays and sends fine but for some reason it does not show my errors or if the message was sent?

Here is a pastebin of the code.
http://pastebin.com/xgTpSg97

and here is a link to the form
http://auto.nathanrobjohn.com/contact-us/