Sounds like your SOL. This is hardly the first time this has happened or the last time this will happen, but since you can't return it to a retailer you don't have much recourse.

Back in the day one of the MP Cassettes came with two left (or maybe right) piledrivers instead of a left and right. Takara did fix the problem for people in Japan. However, everyone outside Japan got zero help unless they spoke Japanese, called Takara customer service, and convinced them to ship a replacement internationally.