ford91exploder
Resident Curmudgeon
The concierge definitely screwed up but I'm sure they didn't do it on purpose and its not like those Halloween dates are announced at the last minute. I know not everyone likes to plan everything out in detail but special events is definitely something I would have noted months in advance when putting my initial plans together on what day I was going to be in each park.
Furthermore, customer service (not just at Disney but anywhere) does have a limit of what they are going to provide to you for compensation. Think of it from their point of view, it is pretty much your word against the concierge's and the concierge technically didn't lie to you (though I'll admit that doesn't make it right). Now they are going to give you the benefit of the doubt but benefit of the doubt is only going to be worth so much in compensation. Even if they were able to confirm everything, there is still going to be a limit to what they can do. If word got out that all you have to do is complain about a CM and some malfunctioning rides to get into the premium events (regardless of how you feel about them) for free, it would not set a good precedent.
As others have pointed out, there are other non-park locations those fireworks are visible from. And even if the app didn't work, if you have a smart phone, you could've easily looked the information up in your phone's web browser instead. Finally, I find it ironic that even though your kid loves the fireworks, you have decided that you will never take them ever again to see them because of this. That doesn't seem fair. I suggest taking some deep breaths, letting the emotion pass, and learning from this experience so that your next trip is as perfect as can be.
If you travel for business you would understand it's a Concierge's JOB ONE to be correct and reliable at all times as these are the people one depends on when operating out of a hotel to make the arrangements for meeting rooms, dining, car service and entertainment for one's clients, But of course Disney can't be bothered to have competent Concierge's because they are expensive.
It seems the OP might have assumed that a Concierge at Disney was as least as good as the ones in any medium to large city hotel, Rookie mistake but it speaks to the general decline in Disney standards i.e. Motel 6 service at Waldorf-Astoria prices.