Small Claims Court here is the same as available in many countries - low amounts and no lawyers to help you. Yes, you can elect to have a representative there, but it is not as easy as they would have to have a great knowledge of the case as the judge will read through the evidence presented possibly ask questions.
You could try and call the shop owners bluff by filling out all the documentation and faxing it to them, along with all the things that you will present at court and tell them they can settle now, or you will see them in court.
But, of course, they might not even turn up to the hearing (I think it is about one month from the time you lodge the documents). If they have intentionally ripped you off or you don't have sufficient documentation to prove your case, chances are they have already been through this before and know the process alot better than you.
Anyway, that is my two cents.
Good Luck.