Kind of in Belgarath's court here, the only possible damages incurred would be related to being under withheld on state taxes. I think they would have to have had substantial distributions for that to be the case.
The obvious question/issue - and one I would make were I the carrier (not that I excuse them for poor service) - is how/why did the recipients only "discover" this only when getting their 1099? That is total BS. If I'm expecting a $10,000 payout and I know that 20% must be withheld for Federal taxes AND I ELECTED ANOTHER 10% (hello, McFly), then I'm also smart enough (I hope) to know that I should be getting a check for $7,000 and realize that something isn't quite right when they send me $8,000.
This lack of personal responsibility drives me nuts - like when a person elects a salary REDUCTION contribution but then doesn't notice (for a whole year even - c'mon McFly!) that their weekly (or whatever) pay did not go down.
Anyway, done pontificating, go 'Cuse, in the Sweet 16 baby!