A judge in Middlesex County has granted class certification in a suit claiming Guaranteed Subpoena Service Inc. effectively overcharged customers in connection with reimbursement checks issued to the subjects of subpoenas.

Superior Court Judge J. Randall Corman on June 22 denied a defense motion to dismiss and granted the plaintiff’s motion to certify the class, according to the attorneys in the case, Vetter v. Guaranteed Subpoena Service.