information subpoena

by ed
(new jersey)

A debt collection law firm has a judgement against me for credit card debt. I receive Social Security and a teachers pension. I just received an information Subpoena form with questions. They state that if i do not answer the questions they state that i could be arrested and or fined.. Then it states that if the judgment resulted from a default , that the judgment can be vacated. Since my pension is exempt from levy do I have to inform them, Or should I just contact an attorney