Hello,
Yes, sure, you can request the refund here: https://themeforest.net/refund_requests/new
Before you request a refund, would you describe the difficulties you came across? I will guide you and most likely you will discover that you have not taken all the theme potential in.
In any case, you would get your refund, I suggest you give one more try to save your time and investigate the theme. I am sure you would be impressed.
Best Regards