I am so sorry to hear of your disappointment. It would be nice if anyone could simply go to their LBS and trust what the ideally well informed and educated salesperson told us. However, in reality, this is frequently NOT the case. Ultimately it is up to us as consumers to do a little research first and not to blindly trust sales people. Don't get me wrong, as I am not trying to "blame the victim" and I do feel your pain. I did a ton of research and was measured, did more research, studied geometries and read fitting articles of all genres from Rivendell and Peter White to others, and still wonder if I had gone up a size.
Bottom line as consumers is to come armed with some information, ask a lot of questions, and if it doesn't feel right sleep on it before spending a dime.
Good luck on getting this remedied. I would like to hear your story.