I agree, a sword or a crypt, although I'm leaning towards crypt. If the leaves all melt off in the tank, you'll know it's a crypt, and don't worry, because they'll grow back. It should do well in your tank, provided it has enough light and nutrients. I'd recommend a root tab to fertilize this plant.
As for bamboo, it's not actually a fully aquatic plant, but an amphibious one. It should do OK in your tank for a while, but it will probably eventually rot and die. While bamboo does better than most amphibious plants when submerged, it's not meant to grow like that. Personally, I'd take it back to your LFS and demand a refund.