Hello and thank you for contacting us. This is Dwayne B. and I’m an expert here and looking forward to assisting you today. If at any point any of my answers aren’t clear please don’t hesitate to ask for clarification. Also, I can only answer the questions you specifically ask and based on the facts that you give so please be sure that you ask the questions you want to ask and provide all necessary facts.
The majority of the questions in the extensive fact pattern appear to be rhetorical but let me answer the ones that are direct questions and then you can ask follow ups as necessary.
I don't think any agency is going to help you on this so you are almost certainly going to have to file a lawsuit. While there is a potential of having a judge in MO allow you to proceed with the case there, the other side is going to object and it would surprise me greatly if you didn't agree to IL being the proper venue in some of the paperwork (either physical or online) you signed or agreed to accept. IL courts definitely have venue and jurisdiction. If you want to consider filing in MO then you need to get a copy of all of the paperwork, screen shots, etc, and take them to a local lawyer and let them examine the documents.
Your whole case is going to hinge on exactly what was advertised, the exact wording, and then the agreements, click throughs, etc. This is because you are claiming that you were promised one thing and the school delivered something else. The good part about that is any time there is a disagreement about what something in a contract means, the contract terms are ambiguous, or the contract is subject to more than one interpretation then the court is obligated to accept a reasonable interpretation given by the person who did not draft the contract/agreements even if the drafting party offers a more reasonable interpretation. This is known as the Scrivener's Rule.