Even if i don't have this problem, i agree they should find a way to resolve this issue, cause obviously there are a change more people have made this same mistake by linking wrong account. People wont be happy with the answer "what is done is done" kind of nonsense, not when they spend hours and money into the game, and even pre-orders the new expansion just to play. It just show a bad customer service in my opinion for devoted players who made an honest mistake, i know Bungie having a lot of things to fix for the moment, but they should of consider this as well as possible chance of happening during migration from Bnet to steam.
-blam!-ing awesome, same issues here. stuck now with a damn steam save instead of having the GOOD ONE from the right battle.net account.