If I recall, air shipping from Japan is still suspended so that means they ship it via boat and it and takes 3-4 months or they use a private delivery service and it takes 3 days.
I'm guessing they never sent it as it was just out of stock and they didn't bother cancelling it earlier.
As far as the situation you described, yes, that is one of the situations that can occur and a cost of doing business but usually can't be abused too much by the same user.