Citibank Debt Collection Complaint

Citibank Debt collection department,

Credit card Taking/threatening an illegal action Threatened to sue on too old debt Tennessee

I received a subpoena from a collection agency threatening to sue me on a time barred debt from 2004.This company has tried several times to garnish my wages but have been unsuccessful due to I only work 1-2 days a week and now they are taking me to court and asking for record of employment, checking/saving accounts, deed to property, titles to vehicles and copies of tax returns for the past 3 years which I do n't understand the need for because I thought it is against the law to try and sue or threaten to sue someone on a time barred debt.