This plugin adds to WordPress the features

This plugin adds to WordPress the features of a complete ticket system with 100% responsive and 100% Ajax functionality. This allows users to submit tickets to report problems or get support on whatever you want. Users can set the status, priority and category of each ticket.

Features:

Unlimited ticket submission through the admin
Unlimited ticket submission through the frontend
Unlimited ticket submission on behalf of users
Guest ticket submission (if enabled) with inbuilt anti-spam protection

http://jvsreviews.com/maticpress-enterprise/