Steam charged me twice...and added two games twice.

What game was it? Just curious.
Also, I'd just dispute it.

I would care more if you only got 1 copy.
Nonetheless, contact Valve, they will look into it

Send in a support ticket and hope they will be kind. :D

Contact Steam support because no one here can do anything.

Contact Steam support?

Contact Steam Support like you should have done and ask them to refund the second.

Talk to Steam support. They should be able to resolve this issue. Good luck.

Is that even good DLC, OP?
I thought only NiN was worth-it DLC

just give up

I got that error once and noticed the stuff was in my account and that I had been charged. I wrote them just to verify everything was alright and it wasn't going to get removed from my account (So I wouldn't miss a sale).

If you get the error, the first thing you should do is check to see if your stuff is there. Steam isn't that great as a browser or with their website coding. I see random errors that don't actually end up meaning anything.

Distance Selling Regulations apply in the EU. Just ask for a refund.

Contact Steam Support.

Are you sure you were charged twice? Steam displays two copies of Civ IV for every customer - one version is for Mac and one is for Windows. They just made a mess of things. Check your email and/or bank account to see if you were charged twice if you haven't checked yet. Many people think they were charged twice for this particular game, but they weren't.

Discussion of this issue is here.

Are you sure you were charged twice? Sid Meier's Civilization IV shows up twice in my games (definitely only bought once), but one can't be installed on my computer. Check to make sure you were indeed charged twice and then contact support.

Happened to me before, too. Traded the second copy.