You need to report the use of your signature and notary stamp to law enforcement and any other entity that regulates your employer.  For them to use your signature and your identity, is identity theft and potentially fraud.  You also want to consult with an attorney to help you with a civil suit, if any, for the inappropriate use of your name.  You do need to pursue at least the criminal angle, because you don't want anything being attributed to you in the event that the employer is every reviewed for other illegal activities.