I couldn't complete the quest
though I asked Khumrack for Razzik's freedom.

Whether I select reward or Razzik's freedom,
I can see the "give scroll to Razzik" message.
So...Razzik is always free.
and I can get the Razzik's glaive always..

But can't complete the quest in both case.

I think you can't have both. If you select the freedom, then you get
the scroll, can set him free and get his glaive.
If you take the money - thats it. No scroll and no freedom for Razzik.

if I selected reward
then no scroll (1000G).

but I go on telling Razzik, He thanks for the scroll and freedom,
get his glaive..

So..

Select reward!

1000G + freedom + glaive

Ah..Beside..whether reward or scroll, can't complete quest ';,,;'

It's bug @_@

Yes, it's a bug. Thanks for the report.