Update:
We finally heard back from Disney Gift Card (despite not being able to call them directly on the phone - once we got someone who was actually in the US based fraud department as opposed to the off-shore call centers they were very efficient). They actually called me 30 minutes prior to getting in my car to drive up to DW - which was about 5 days after I initially reached out to them. As suspected - one of the gift cards that I loaded onto my card had been compromised. By that point I had also been able to get my money refunded from where I purchased the gift card so she was able to remove the compromised funds and unblock my card.
Went to Guest Services at Disney Springs the night before our park day and gave them the saga (they had a number of notes seeing what happened to the LLs) and they gave me 3 anytime passes to use the next day. Because of all of the uncertainty - we ended up just doing the 1 day at the park (although we did from 8:30 am - 1:00 am and 3 parks!)
We got lucky and were able to get a ticket to the first public preview day for
Epic Universe on what would have been the second Disney day and it was amazing!
So - in the end - everything worked out although it was a bit of a trek to get there (I added up my call logs - nearly 9 hours on the phone between all of the people I needed to deal with!!)