Well it took a few days and waiting 4 hours today for a callback from Delta, but I finally got this resolved. Delta converted the miles + cash used to buy our tickets to miles and put them in my Skymiles account. Hopefully in a couple of months when the flight window for 07/2021 opens up we'll be able to get first class tickets once again.

Other than having to deal with an overloaded phone and web message system, I was pleased with how quickly Delta was able to deal with this.