Does Apple reject "mobile web shell" applications?

Put some functionality that gives your app look like native application.

Make sure that your description for app is enough for understanding to Apple app tester about you app.

and resend your app to apple store or you can send reply to apple review team about your application.

See section 2.12 in App Store Review Guidelines:

Apps that are not very useful, are simply web sites bundled as apps, or do not provide any lasting entertainment value may be rejected

FWIW a company I worked for put an app through the App Store that was little more than a browser in May 2013.

It probably helped that the website it pointed to had an extremely responsive design, was a media player with play buttons etc. Also played video inline, which you can't do on mobile Safari (because mobile Safari will play the video full screen).

Apple may reject your app if all it does is wrap a web site in a UIWebView. You need to have more functionality in your app than just loading a web page.

From the app review guidelines for iOS:

4.2 Minimum Functionality

Your app should include features, content, and UI that elevate it beyond a repackaged website. If your app is not particularly useful, unique, or “app-like,” it doesn’t belong on the App Store. If your App doesn’t provide some sort of lasting entertainment value, it may not be accepted.

You may want to investigate developing your company's app as a mobile web app. There's plenty of information published by Apple (and others) about how to write mobile web apps that function similarly to native iOS apps.