Help with Shadow Edge quest

I bought Shadow's edge 3 months ago From Warmane Store with coins . And now i want to do the shadowmourne quest , but i cant becuase first i need to finnish the shadow's edge quest.Can u help me start the Shadowmourne Quest.I already sent ticket in game and asked GM but he didnt give me the right answer.He told me to refund.

Same here, but i read in the forum that we have to do all the quests.
That weapon is a waste of coins.