Hi
Thank you for contacting us.
I'm Jackie, leader of the NooTheme team.
We are really sorry if you aren't satisfied our theme and our support service.
With every question about the theme config, theme error, and small the custom we will support you free by the Envato policy.
With the custom the theme question, changing any style of the theme as your requirement, we can charge the fee based on the custom and the work.
Don't worry about that, if you want to custom the theme and the style, please note all your requirement then we will charge a small fee for you.
For the support policy, you should read this article by Envato author:
https://themeforest.net/page/item_support_policy
Thank you.
Jackie.