urgent help, Plugin for user management!

hi, I need help with my site, I need a plugin that allows you to manage users in this hierarchy:
there is a admin who manages all and can send messages and / or files to a single client in private, then under the administrator there is the salesman who manages a group of customers who can send files and messages to all those of his group, and finally there are groups of customers, but customers cannot see other customers of their group or other groups, they can only see the commercial and send messages only to the commercial, if you can help me I am grateful