@mahdiyazdani well if a user doesn’t find the premium support button, maybe is not his fault but is your fault that you don’t made it clear.
Go watch some UX/UI Courses.
Anyway if a PAYING client does something wrong you SHOULD NEVER treat him like an idiot, not satisfied clients are NEVER a good thing, we wasted more time doing this stupid conversation than watching my problem.
But i’m not telling you how to run your business, you are free to get 1 star reviews for your plugin.
Going somewhere else, where developer knows what customer care is.