how to get a refund - theme doesnt work, no snwer from support

Hi, can you pls help - i purchased that theme here Support for Acacio - Landscape & Gardening | ThemeForest
but it breaks the site and doesnt work at all, no demo import possible, etc. I contacted support but no answer, what can i do to get a refund?

contact with your purchase item author right here as a comments

Author will help you