Hmmmm.... it still sounds a bit suspect.
I've done cakes where I've noticed after I've delivered them that I didn't stack them perfectly centrally.... none have ever fallen, though (thank heavens!!!!)
Had the OP "just" been told the cake fell, then maybe that would be believable. But to be told that the WHOLE THING was raw, too? Nah.... someone is really trying to make sure that there was an excuse why none of the cake was served.