Also, re: the issue with Closer, here's the resolution I posted in a separate thread:
Just confirmed with the DLC team and with Microsoft that this is resolved. As other posters have reported, if you purchased Closer this morning and received The Weight instead, simply redownload Closer and you'll get the correct track. The Weight will remain in your library and will now appear in the store as if you have already purchased it (which you did, accidentally).
I'll raise a note about all the international stores but my expectation is that they will likely have a slower roll out.
Restitution is that the problem has been resolved and it is relatively hassle free for all involved. Thanks for sitting tight for a few hours while we sorted things out.
Purchasing either Closer or The Weight from this point on should get you the intended track, so buy away!