Notwithstanding any judgment, decree or order of any court, anything done or any action taken (including rules or orders made, notices issued, evictions ordered or effected, damages assessed, rents or damages or costs recovered and proceedings initiated) or purported to have been done or taken under the public Premises (Eviction of Unauthorised Occupants) Act, 1958 (32 of 1958) (hereafter in this section referred to as the 1958-Act) shall be deemed to be as valid and effective as if such thing or action was done or taken under the corresponding provisions of this Act which, under sub-section (3) of section 1 shall be deemed to have come into force on the 16th day of September, 1958, and accordingly--
(a) no suit or other legal proceeding shall be maintained or continued in any court for the refund of any rent or damages or costs recovered under the 1958-Act where such refund has been claimed merely on the ground that the said Act has been declared to be unconstitutional and void; and
(b) no court shall enforce a decree or order directing the refund of any rent or damages or costs recovered under the 1958-Act merely on the ground that the said Act has been declared to be unconstitutional and void.