If a determination is made under:
(a) subsection 7C(2); or
(b) subsection 7C(3);
then, except in a proceeding instituted by the Attorney - General of the Commonwealth or the Attorney - General of a State, any act or thing done by the ACC because of that determination must not be challenged, reviewed, quashed or called in question in any court on the ground that the determination was not lawfully made.