Laws are different according to your jurisdiction. Here in AR I would suggest small claims court, bring all paperwork, and let a judge decide. There is a $5000.00 limit. No attorney is needed, but if you retain one, the case moves from small claims to civil. Filing fee is $65.00, plus subpoena service. You can, and usually will get, filing fees and any other out of pocket expenses if you win your case. Loss of wages due to time spent in court is usually not awarded. Much will depend on the specific purpose of the security deposit, whether it was for cleaning, damage to the property, or securing rent payment.