Completely block Spotify sign-up from iOS authorization flow

We are developing an iOS app and having a "really fun" time trying to get it approved to go in to the AppStore. We are leveraging parts of the Spotify API in our app, so are using the Spotify web authorization flow. On the sign in page provided by Spotify, it shows 'sign up' links as well as the sign in links. Apple did not like this, as it violated 'Guideline 3.1.1 - Business - Payments - In-App Purchase' as we were promoting other apps within ours. We found the adding nosignup and nolinks request parameters removed these links: https://accounts.spotify.com/en/authorize?client_id=xxxx&redirect_uri=https:%2F%2Fapi.xxxx.com%2Fapi%2Fmobile%2Fspotify%2Fauthenticate%2Fcallback&scope=user-read-currently-playing&response_type=code&nosignup=true&nolinks=true

However, we're once again being rejected. We have an App Store icon appearing in the returned response, encouraging users to download the Spotify app. This is apparently a violation of 'Guideline 3.2.2 - Business - Other Business Model Issues', as we're apparently imitating the functionality of the App Store! The above request parameters are entirely undocumented from what I can see, and were found only by sniffing the traffic between existing apps. Question is, is there another request parameter to turn off this App Store logo? Or any other way to hide it?

Apologies for the length of this post. It is in part a rant to alleviate myself of some of the pain I'm feeling having to deal with Apple.