Does Valve have the right to remove a game from a bundle that I paid for?

Here's a situation that's probably best answered by a lawyer that understands digital distribution of games and software through mediums such as Steam.

The situation is this: I already had a copy of a game on Steam, purchased about a year ago: Portal (the first one). This game was launched originally as part of a bundle called The Orange Box which also included 4 other games.

A couple of days ago, I realized that The Orange Box bundle was on special, and I started the purchase process as I wanted to play the other 4 games. Considering I already owned Portal, I was expecting at first to get a second copy, which I could potentially send as a gift to a friend for them to play (and hopefully buy Portal 2 and play Co-Op later).

However, upon purchasing the item (before going through to payment), I was informed by the website that "since I already owned Portal, I would not get a second copy" (wording is from memory). I have opened a ticket with Valve (makers of both Steam and all games of The Orange Box) asking for the game to be added to my account. I have not yet received a response.

My thought is this: Because this is digital distribution (aka no physical copy of the game), Valve seems to believe that they have the right to simply remove the second copy from the bundle, simply because they can. If this were a box with actual DVDs of the games, I could simply take the Portal DVD and give it to a friend, but the digital distribution mechanism makes this a completely different world.

I understand the fact that I did, in fact, go through with the purchase and "agree" to forfeit my second copy, however I strongly believe that this is akin to theft, and would never happen with a physical distribution method.

Could anyone weigh in on this? Note that I am in Canada (Quebec), so I'm not sure if I could even place a complaint at the BBB or if I need to go through the Canadian equivalent (consumer protection I think).