The commission shall give a complainant who has filed a complaint a notice of a right to sue upon:
Notice of right to sue shall be given immediately upon complainant being entitled thereto, by personal service or certified mail, return receipt requested, which notice shall inform the complainant in plain terms of his or her right to institute a civil action as provided in this section within ninety days of the giving of such notice. Service of the notice shall be complete upon mailing.
W. Va. Code § 16B-17-13