Unfortunately, dismantling is a permanent action :(
http://www.bungie.net/en/Help/Article/12211
English
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I had a similar issue with an ea game but unlike bungie they said ok we are sorry out game had a glitch and are sorry for your inconvenience and they gave my items back but I guess bungie is above accepting responsibility for the coding errors and glitches in their game
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there is no way that you can create all these items but not have the ability to put one on someone's account, bungie chooses not to help not that it can't. so basically I should just trade this game in and be done with it I guess. that's really disappointing, but I'm tired of grinding to get items then I finally get one and this dismantling glitch happens and I'm just told there's nothing that the creators can do what a lie