That's awful. . . Though arguably the N. campanulata still looks in *decent* shape.
Still you need a refund. What venue did you purchase these through? Ebay, proboards, etc?
Thanks for the heads up and good luck. I would definitely repot them and if the roots are rotting like Exo suggests (which is quite possible) you may need to even cut off all the rotting portions of the plants and try to root the growth points if no more good root is left.