I had an app that was free, but was solely a client for a paid service. Despite putting this in capital latters at the top of the description, it still got load

I had an app that was free, but was solely a client for a paid service. Despite putting this in capital latters at the top of the description, it still got loads of negative reviews saying that it was misleading and wasn't really free. It was exasperating as I was never pretending it was anything but that, but I consoled myself with the fact that the people who actually needed it would be coming from the site and were already paying users.