I would think that the best you can do is get a credit towards a new set. Getting replacement wheelset is likely not going to happen.
I would also think that it is not a case for a CPSC recall or a voluntary recall unless serious injury can result. Failure on the part of a user not inspecting the wheel at all after the warranty period might be a factor.
Carbon wheels had issues early on and there were some recalls. If the delam doesn’t result in a sudden catastrophic failure leading to injury, it is just an unfortunate situation.
Hopefully the LBS will work with you on getting a credit. If you have to wait, you’ll need to figure out if you want to continue with that LBS or move on to one that will help you more on a new set of wheels. You might even consider buying a non-carbon training set as a carrot for a shop that will work with you and Giant on resolving your carbon set.
John