The first thing you have to understand is to STAY OFF THE PHONE!!
Never communicate with any collector over the phone as phone calls do not protect your rights under the law, and cannot be used in court.
Communicate ONLY in writing, and ONLY via CERTIFIED MAIL, RETURN RECIEPT REQUESTED. Be sure to put the cerified# in the body of the letter and keep a copy of the completed letter for your records as this proves exactly what you sent. NEVER sign ANYTHING you send to a collector, or your signature could end up on a contract.
By the means above, IMMEDIATELY reply to the lawyers and the court. Keep it simple. Deny everything. Do not admit to anything in your response. Keep it short. "I hereby deny all claims against me" then reference the case number/ docket number only. DO NOT sign the copy you send the lawyer, just print your initials.
Now, you want to immediately check your state laws on collections and garnishments, as well as statute of limitations on civil debt. Some states have SOL's as low as 3 years which means the "debt" may not be "legally collectable" anyway, and that would be your defense.
Some states do not allow wage garnishments. The rules are different in every state. Learn yours. They are all readily available online. budhibbs.com is a good place to start your education.
From my past experience I can tell you that your best defense is based on the amount of the suit. Challenge the amount, and it gets tossed almost every time. Here's why/how.
It isn ILLEGAL for any collector to add collections fees to a debt collection amount. They can only collect what was owed under the terms of your contract with the original creditor. And, after "charge off" all late fees and penalties must stop, and interest must be reduced down to an amount specified under federal law, which I believe is 6%. Accounts deemed uncollectable must be "charged off" no later than 180 days after the first major delinquency.
FYI...NOBODY can sue you, garnich your wages or even put you in collections if you are deployed on military orders. AND, all debts MUST be reduced to 6% and all late fees and penalties removed under the provisions of the SERVICEMEMBERS CIVIL RELIEF ACT. But you have to assert your rights under this law, in writing.
BUT any attorney that knew you were deployed, also knows this law which puts them in a violation of ethics situation. File a Bar Association complaint against all attorneys involved.
Remember, STAY OFF THE PHONE!!!!!