Your business is a fraud and I demand my money back. I purchased a 20 package of classes for $20 and want every dime back. All this experience has done is waste my time. The arduous registration process, having no operator to speak with directly, several attempts to register for classes (always at capacity) and now my voucher is rejected from your system.
If I don't see a refund in the next 24 hrs I will consult the Better business bureau,file a complaint with the complaint board and ultimately shut your fraudulent business down.
You should be ashamed of yourselves for providing the public with such a disservice.