This is probably a really bad thing to say in a first post, but I guess I may as well: I don't think protesting to Bandai America will do very much.
Think about it... There are plenty of other franchises for Bandai to milk now- such as Ben 10 and Thundercats, to name some of the most popular at this time. Logically a large business like Bandai will milk the cash cow that produces the most milk, and Tamagotchi probably isn't one of them anymore.
By now, we don't even know if Bandai America still has the data for the old versions of TamaTown, and it's unlikely that staff will want to go to the trouble of re-tweaking the newer TT if so little people will use it. It's not only a hassle for them, but I'm pretty sure running these sites costs money and Bandai America are probably not looking for a loss any time soon.
And, arguably, Tamagotchi's popularity has decreased significantly in recent years (new technology, fans "growing out of it", gimmicks putting old fans off) and, compared to the fanbase within Japan, fans in the US and in Europe are pretty low. You can tell me the people on this forum prove otherwise (hey, I'm still a fan), but the popularity today is nowhere near as high as it was in the day.
Alongside all of that, practically all of these emails people are getting are practically copypasta. Bandai either know we're upset and genuinely can't get the data back, are working on other things (hence, no time for TT) and/or don't care. Like SailorRosette already said, emailing is probably futile- and going to their headquarters will probably make us look like pests more than anything else.
Sorry for my negativitiy; I just think these things happen, and there had to be a day where the sites would come to an end. Shame it was so soon since I too am here because I couldn't log in.