104. An advocate who is not in the employ of a regional centre or the Commission may, at any time, replace, within the scope of the same mandate, another advocate from the same firm to whom the mandate was entrusted. Such replacement is effected by means of a notice signed by the person receiving the services and sent to the director general or the Commission, as the case may be, that entrusted the mandate. The notice indicates the legal services for which the replacement is made and the duration of the replacement. The director general and the Commission are bound by such notice.