VQuiz doesn't work, support doesn't respond, you've taken your money and you're

VQuiz doesn't work, support doesn't respond, you've taken your money and you're doing nothing

I am sending support tickets but no one is responding.
I can't use vQuiz, so I want a refund.
I paid, but in the "Downloads" section I don't have anything to download, as if I hadn't paid.

Why can't I download the paid component?
I installed it from last season, but it doesn't work. can't display the courses, can't display the list of courses, it doesn't work.

If your support doesn't work, please give me a refund.