Most apartment owners/management companies use this standard "trick" to keep the deposit. Sampada is right about, always make sure that you walk in with the apartment manger for the final inspection and have them write down in prints if evertyhing is ok (or not ok). Later if you have to prove something in the court of law or convince someone, the written statement is more useful than "I even spoke with the lady from the property management to make sure things were good and she said its all good and my deposit check was in the mail."

Depending upon which state you are in, as a renter you have a certain rights (unfortunately most states favor landlords than tenants.) You can file a complaint to Renters Association or Apartment association or some sort, most of the state have a government agency who look after these things. But like Sampada said, you must have some kind of strong proof/point to convince them why you are right  and they are wrong. But I would suggest you to go to Property manager and talk to them nicely and try to negotiate with them. Tell them they can keep the deposit and forget about the extra $223.70. But if you are just like me, a righteous, I would go to small claim court and try to fight with this. Normally small claim court does not cost much for plaintiffs, but it could be costly for the defendants. But before doing so write them a letter of your intentions, most of the landlords try to stay away from lawsuits. Hope this will help.