User support plugin. Registered users will be able to create/ reply support tickets. Admin can reply on the tickets from admin panel.

Handy Toolbox & Get Expert WordPress Help (Advice, Custom Tutorials or Done For You) Directly From WP Admin

Let customers create and reply to support tickets without an account or login. A WordPress customer support system and help desk for your website.

Free WordPress support tickets, uptime monitoring and expert guidance in your dashboard, with optional 24/7 live chat plans.