No person shall be excused from attending and testifying or from producing books, papers, correspondence, memoranda and other records before the Department, the chairperson of an appeal tribunal or any duly authorized representative of either of them or in obedience to the subpoena of any of them in any cause or proceeding before the Department or an appeal tribunal on the ground that the testimony or evidence, documentary or otherwise, required of that person may tend to incriminate that person or subject that person to a penalty or forfeiture, but no individual shall be prosecuted or subjected to any penalty or forfeiture for or on account of any transaction, matter or thing concerning which that person is compelled, after having claimed the privilege against self-incrimination, to testify or produce evidence, documentary or otherwise, except that such individual so testifying shall not be exempt from prosecution and punishment for perjury committed in so testifying.