A year?! Wow. That's better than most B&M stores. I must say, with digital media when you can't try before you buy, having this sort of policy is very attractive.
It seems that to deal with Kobo one must telephone. Stuff happens when you do that. By e-mail you get nowhere quickly. It seems they issue in store credits in situations such as this. So, like Diesel, whilst they say "no returns" it looks like you may be able to get one if the circumstances are right. Still, it does seem that Diesel's policy is more open-minded.