Mistakes like this need to be reported immediately if there is any hope of fixing it at all. A week later is way too long, even if they could help.
In this case, they don’t swap quest rewards. They never did that I remember. Nor would they give you an item that was “ninjad” from you, or that the raid lead messed up Master Loot with.
Here is the policy stating they don’t swap quest rewards. WoW Classic Customer Support and You
This is only going to get you into trouble for abusing the GM ticket system. While you can always put in the ticket to ask, once you get an answer I strongly suggest you stop. They can, and will, suspend you for spamming them on an issue that they have already replied to - and have a clear policy on.