Good luck with that.
Depends on how understanding they may be, however, you have to give them an opportunity to put things right for you, but they can not really do that until you fix/replace the snail cam bolts I am afraid.
If you fix the bolt issue then they may not charge you for a further alignment, but they are quite within their rights to do so if they so wish.
As I previously said, you have paid for a service and it was not the garages fault that the snail cam adjusters were seized.