A: Most of the time you should be able to get a new check, if you make the request promptly, and the check you were issued has not been cashed. They may require you to pay the stop payment fee on the earlier check. Make your request quickly, because in many class actions, unclaimed money goes to charity or back to the defendant a certain amount of time after the checks are issued.
A: You can start by writing a letter demanding your refund. If that doesn't work a complaint to the Better Business Bureau or the Illinois Attorney General's consumer division might get their attention. Depending on how much money is involved, you could also contact an attorney who specialiazes in consumer law.
A: You may be able to sue for breach of contract, or possibly violation of the Illinois Consumer Fraud Act (depending on the specific facts). You can file suit yourself in small claims court. You might also be able to get results by complaining to the consumer division of the Illinois Attorney General's office. Finally, you might want to talk to a consumer class action attorney, if you believe there are lots of other people in your situation and the promoter is refusing to return anyone's money.