This is a primary hybrid (canaliculatum x madidum).
IOSPE PHOTOS
IOSPE PHOTOS
I am surprised to hear you are growing this inside, Cyms do really well outside. They can also tolerate temps to just above freezing, although I wouldn't let it get quite that cold. The canaliculatum is warm growing, and both parents are from Australia.
Bulb shriveling could indicate root loss, and you might want to dig into the medium to check the roots on this. The type of spotting could be from fungus, but like cloudswinger said sometimes this can be from water sitting on the leaves. To cut down on the spots, you need good ventilation. Mine are outside, and I use the water hose on them, but the ventilation is good, and they dry fairly quickly. The water drying quickly on the leaves is a important.
This was a long stressful trip for this plant, and you should let the grower know what is going on with the plant, and perhaps just give it some time to acclimate. If it looks like it is getting worse, definitely contact the grower again immediately.