If you want to get a refund you have to contact the App Store directly.
Carlos has mentioned that this is the only way to do that and that's the same for any official publisher on the App Store. Steinberg cannot do this automatically.
For every release you will find a release note that will cover all the important bugs we've fixed.
Carlos usually create a thread on the related forum. For instance, the latest release of Cubase iC you're mentioning improves the reliability of the connection. You can find all the other fixes here: viewtopic.php?f=135&t=35309
Could I ask whether you'd think of a better place to report this information in the future?
I'm afraid I do not understand which report you've made that wouldn't have been given any reply.
I remember we tried to support a connection problem here: viewtopic.php?f=174&t=33939
At one point of the discussion it seems more and more apparent that there's is something preventing Cubase to access the outside world on your computer. Did you try the last advise provided by one of our users?
Anyway, if you want to try again with Cubase iC Pro I suggest you to wait until the version 1.0.4 is released. Carlos has already reported that we've implemented a manual connection helper now and that will hopefully fix the last issues we know with Bonjour: viewtopic.php?f=174&t=38475
I hope that this covers all your questions.