Try suing them in your local small claims court. Chances are, they won't show for the trial due to the "piddly" amount involved.
Result: default judgement.
A default judgement will allow you to turn them over to a collection agency which always makes for an interesting day.
If you can't get your money back, get even, get retribution and get a chuckle out of making their life a bit as miserable as they made yours.... ALong the way, you'll have some fun learning what you can do with the legal system.