No you should absolutely not fill out such a form. It is not going to help you; it will hurt you. If the law firm is suing you over a debt owed to its client, you need to make sure that a) you indeed owe this money and b) the statute of limitations to sue you has not passed. If the statute of limitations in your state has passed to sue you for a contractual debt and you have not re-affirmed the debt to start the statute of limitations again, you may wish to dispute the debt through your credit reporting agencies who have this debt listed on your report. Further, you should ensure all communications (if you do owe the debt) between you and the firm are in writing and indicate you will agree to a payment plan but you will not share your personal information with some third party who does not represent you or your best interests.