At
https://control-webpanel.com/support-servicesIt clearly states just, SERVER SECURITY CONFIGURATION, SERVER PERFORMANCE CONFIGURATION, THIRD PARTY APPS INSTALLATION, REAL-TIME SERVER MONITORING.
And under Monthly Guarantee for $12.99/Month:
We understand that continuous monitoring and updates can be a pain to take care of, especially when you have multiple servers and many things that need to be handled. That’s is why Managed support is the best option for you.
Your not going to get a Managed Server service for US$12.99/month. And says 'Monitoring & updates'.
Even at around $150/month you usually only get 2-3 hours of included support per month.
From your initial post, sounds like your inhouse admin is use to Webmin & DirectAdmin, and manually editing configuration files.
Unfortunately, that sounds like it might be the best course for you to stay with.
Multiple different OS's and control panels can cause eye's to start getting crossed.