In order to remove an organization in Bunnyshell, please follow the steps below:
Remove all servers (Virtual Machines or Web Servers) and all applications (make sure you removed them from cloud as well).
Disconnect all repositories (gitlab/github/Bitbucket).
Remove backup provider.
Connect you cloud with wrong credentials (this will erase the good ones).
In order to remove the organization follow this link: https://cloud.bunnyshell.com/settings/organization/user-settings/ and click on the "Remove Organization" button.