You can e-mail them, and they'll send you a black one for free.
It happened to Thrawst
You can play the lottery, and you'll win it.
It happened to someone.
There. Logic is awesome.
i have had this many times (i order off the internet almost exclusively) and when i have had wrong items delivered, the company just says keep it ans well send you out the correct ones, has happened with:
logitech mouse (incorrect colour),
2.5mm cable instead of 3.5mm,
normal instead of clear duck tape,
verbatim dual layers with wrong dye,
etc
all of these situations (off the top of my head), the company sent out the new items without returning the wrong one - it just gives the company an even better reputation