Planet13 - 3:55 pm on Feb 5, 2012 (gmt 0)
Look at the contract you signed with the guy. It may be that you can sue him in small claims court.
There is probably a time limit on when you can sue, so I would do it quickly.
Hopefully, you won't have to sue him. Hopefully they will have got the knowledge that he needs to know how to do a proper job, and will be willing to re do it properly for free to avoid having his tucus hauled off to court...