Can't finish Aldeth Sashenstar quest

I have killed all the dopplegangers yet Aldath and the gaurd keep saying there are more left. I have searched all three levels and there are none left. Have others run into this?
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Alternatively, if you're playing on PC you can use the console: SetGlobal("AldethDopple","GLOBAL",16)
SetPrivateProfileString('Program Options','Debug Mode','0')
Change 0 to 1, go into game and Ctrl+Space to open the console and type: C:SetGlobal("AldethDopple","GLOBAL",16)
Thanks allot Artemius_I!
I'm playing via Steam, if it matters.
Questions:
-Can I write the entire line in to the mix and have it work?
- if so, can I just add it in at the end or does it need to follow any other specific text already in the file?
Thanks Much.
Finally do you have a save showing this issue?
Is 100% reproducible. Weaken a DG and let one of the guard NPCs finish it off. Can't finish the quest at this point.