Doctrine of Administrative Remedied and Doctrine of Primary Jurisdiction
a) where there is estoppel on the part of the party invoking the doctrine;
(b) where the challenged administrative act is patently illegal, amounting to lack of jurisdiction;
(c) where there is unreasonable delay or official inaction that will irretrievably prejudice the complainant;
(d) where the amount involved is relatively small so as to make the rule impractical and oppressive;
(e) where the question involved is purely legal and will ultimately have to be decided by the courts of justice;
(f) where judicial intervention is urgent;
(g) when its application may cause great and irreparable damage;
(h) where the controverted acts violate due process;
(i) when the issue of non-exhaustion of administrative remedies has been rendered moot;
(j) when there is no other plain, speedy and adequate remedy;
(k) when strong public interest is involved; and,
(l) in quo warranto proceedings.
Exceptions (c) and (e) are applicable to the present case. (Rep., et al. v. Lacap, et al., G.R. No. 158253, March 2, 2007).