The courts are not too keen on civil RICO cases, so the interstate commerce requirement is the least of your worries. If you can get past that, you will have to prove all kinds of other things that are very difficult to prove. Some other law might probably be a better bet, such as the Illinois Consumer Fraud Act, where it is much easier to plead a case. You really should see an attorney if you have a good case.
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Your best bet is to take all your evidence to a consumer protection lawyer now and have them evaluate the matter. If they tell you there isn't a viable case, you will save yourself a lot of time.
Most lawyers that practice consumer protection law offer free or low-cost initial consultations.
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