I am sorry to learn of this situation.
The judgment that they got against you was likely entered "by default" following fraudulent service (some process server or other individual singed a false statement saying that they served you with the summons and complaint).
You can file a motion to vacate this judgment (and get the money back that was pulled out of your account), as well as fight the underlying claim (You would have a breach of oral contract statute of limitations of 3 years, the security deposit cannot be created after the fact, all of this is created by hearsay (statements by the manager who was not a party to the claimed conversation and unsupported by any documentation, rent payments cannot have deductions made against it).
While you can do all of this yourself, it is a little complex, and I believe that if I understand you correctly you have a timing issue (you are already suffering from wage garnishment, you have other things that are more pressing - work, raising your children, etc., and you want to avoid as many future garnshments as possible) - all of this means you will want this addressed as quickly as possible.
The fastest, and most efficient way to deal with this would be to hire a lawyer (you aren't entering into lengthy or drawn out civil litigation here, you really want an attorney that is going to send this management company a demand letter to return your money, vacate the judgment, and redact any claims they made against your credit - and if they don't he will be forced to file motions with the court seeking sanctions in the amount of his legal fees incurred in dealing with this matter due to the fraudulent proof of service.
You can find local attorneys using the State and local Bar Association directories, or private directories such as www.AVVO.com; www.FindLaw.com; or www.Martindale.com (I personally find www.AVVO.com to be the most user friendly).