I suggest you to contact the author of the theme, they will surely help you on that.
HI , I would like to get refund for my product ,Which i have purchased…
Give it a read here first: https://help.market.envato.com/hc/en-us/articles/202821460-Can-I-Get-A-Refund-
and then sent a request here: http://themeforest.net/refund_requests/new
All the best
This guy also looking for some to code his designs: http://themeforest.net/forums/thread/looking-for-coder-to-partner-with-on-wordpress-themes/153615 Take a look