If they are not working on the gun, and they are sending it to Benelli, what can you do to them. Gander Mountain sells alot of stuff, They can't just let you trade up for for broken shotgun. It doesn't work like that, At least not very often.
Trust me, I've been in your shoes with a broken shotgun. I understand, I was pissed to. But my friend let me have one of his until mine came back. Then I went to buy a benelli, and everthing is good.
Good luck,
novaking