Sorry to hear that! Well if you haven’t downloaded the theme yet, themeforest can refund your credits. However if you did download it there’s nothing they can do. This restaurant theme isn’t responsive, but does include a similar looking menucard with sliding effect.
We don’t have any options to refund our buyers, so you’d have to contact themeforest support for that. You can always explain the situation and see how they reply 🙂

Cheers and good luck!