I bought new vegas for the xbox 360 and got a code for the caravan pack but its for steam, what Iam supposed to go with it?

huh. id call customer support, although I'm pretty sure your only supposed to get the voucher if you preordered. at least that's why I preordered.

If you bought this from a Legitmate Store, then I would take it back and exchange it.

If you purchased this used, if the code was already claimed, you may not be able to use it if the first owner used the code. If you purchased it used from a place like Gamestop, they may exchange it for this reason. However the code you get may still not be useful to you if it was used before.