Zero iAd Requests for the Life of an App

I have included ads in the iOS 7 iPad app using the iAd system. And I tested ad integration successfully - could see test ads for iAd. But I have never seen any advertisements since the release of the app on the App Store. The iAd portal always shows 0 requests, although the status of the app is "Live Ads".

I implemented both interstitial and banner ads (landscape mode) and received ads with the message "You are connected to iAd" while testing on device and simulator. However, I don't see any ads in the app after it lives in the App Store.

• I have implemented interstitial ads like this:

  // AppDelegate application:didFinishLaunchingWithOptions:
  [UIViewController prepareInterstitialAds];
  
  // Controller viewDidLoad:
  self.interstitialPresentationPolicy = ADInterstitialPresentationPolicyManual;
  
  // When a user transitions from one screen to another within an application:
  [self requestInterstitialAdPresentation];
  
        
  
          
          
          
        
  
      

• Banner ads are as follows:

  // ViewController viewDidLoad:
  _bannerView = [[ADBannerView alloc] initWithAdType:ADAdTypeBanner];
  _bannerView.delegate = self;
  [self.view addSubview:_bannerView];
  
  -(void)viewDidLayoutSubviews {
      CGRect contentFrame = self.view.bounds, bannerFrame = CGRectZero;
      bannerFrame.size = [_bannerView sizeThatFits:contentFrame.size];
  
      if (_bannerView.bannerLoaded) {
          bannerFrame.origin.y = 0.0;
      } else {
          bannerFrame.origin.y = -bannerFrame.size.height;
      }
      _bannerView.frame = bannerFrame;
  }
  
        
  
          
          
          
        
  
      

I requested technical support from the DTS team, but they were unable to provide me with any support for this issue and suggested contacting the iAd network support team, which I did twice already. They sent my request to the "appropriate team" a month ago and there has been no response since. After completing the request, they report that the iAd App Network team is still viewing my request.

Any ideas how to solve my problem, how to proceed further? Could this be a problem with my code?