(2) In the case of the grounds specified in subsections (1)(a), (c), (f) and (g), the Registrar shall cause to be served a notice on the trade union or employers' organization specifying the grounds on which he or she intends to withdraw or cancel the registration, and the organization shall within 8 weeks or such longer period as the Registrar may grant, commencing from the date of the service of the notice, comply with the requirements of the notice and remedy the default, failing which the Registrar shall cancel the registration.