This is the message I got from them:
We found that the experience your app provides is not sufficiently different from a web browsing experience, as
They're saying that you can't just make a UIWebView that is linked to a website and call it an app. You have to incorporate more features. According to the description, your users can accomplish the same tasks by just going to your website. Are you able to incorporate push notifications, tabs, any features that makes your iOS app unique?