You would need to contact a consumer rights attorney. However, you can sue them, yourself, in small claims court (assuming that the value of the bed is within Illinois' small claims jurisdiction).
Ms. Berjis is licensed to practice law in the State of California. The laws of your jurisdiction may differ and thus this answer is for informational and educational purposes only and is not to be considered as legal advice. Since all facts are not addressed in the question, this answer could change depending on other significant and important facts. This answer in no way constitutes an attorney-client relationship.
Consumer protection, that said, you might be able to dispute by calling management or through your credit card.
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Any lawyer who handles general business law cases can handle this claim. Depending of the value of the bed this may also be a case you should consider handling yourself and save the legal fees.
This does not appear very complicated, you bought a bed, you paid for it, it did not have all the pieces.
YOur state may also have a consumer protection act that may increase your damages. The consumer protection act in Pennsylvania for instance provides for three times the damages.
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