49. (1) A decision of an augmented Commission or a Redistribution Committee made, or purporting to be made, under Part IV—
(a) is final and conclusive;
(b) shall not be challenged, appealed against, reviewed, quashed, set aside or called into question in any court or tribunal on any ground; and
(c) is not subject to any proceedings for a writ of mandamus, prohibition or certiorari or for an injunction, declaration or other order in any court on any ground.
(2) A reference in subsection (1) to a decision shall be read as including a reference to a refusal or failure to make a decision.