Legal Question in Consumer Law in Illinois

An arrangement for services for payment is a contract and if the service provider fails to provide material aspects of the services then yes breach of contract is the customary route.

"Detrimental affect": sometimes a disreputable company will tell you what they will do and then intentionally fail to follow through. That is called "fraud in the inducement" and so you may have a fraud action that led you to sign a contract that they intended not to perform or give you less than you should have been entitled to.

Discrimination? Nothing you've presented suggests "discrimination".

If you know of other people who have been affected by the same behavior, you call all sue separately, or you can see if an attorney might be willing to take on a "class action" - often class actions help people who on their own have relatively less at stake and for whom mounting a lawsuit could be costly, but for under $2000 you can risk a small claims action.

You can also report the company to the government if the services provided are licensed or require permits of some kind, or to the police as a "white collar crime" of sorts, or to the Better Business Bureau so others will get the low down....