Do delete a company, you will need to first make any host accounts who are set as 'Admin' to a regular 'host'. Then you need to delete all hosts from the company. Then remove the subscription from their account via the reseller admin portal.
We recommend to put 'xx' before and after the company name as well. At this point, it isn't possible to delete the company subdomain.
Please reach out to support if you require additional assistance.