You don't.
Read Carefully: [url]http://www.bungie.net/en/View/bungie/eula[/url]
You are LICENSING the rights to play Destiny.
Any content that may have been on the Disc at time of purchase is not yours it belongs to Bungie and Activision.
Therefore you were never cheated out of any content as it was not yours.
If this is unacceptable to you there was a 30 day refund policy granted to you in the terms & conditions that you probably didn't read. If it has been more than 30 days you have no one to blame but yourself.
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Yeah they're saying that the content is being licensed to us like we are legally able to access it. Because this content is copyrighted and they dun' wan' none o' dat theft business they let you enjoy what they have made but you just can't say you OWN what they have made. You own the right to play it not the right to it. :D