First instance body dealing with electoral disputes

Canada Elections Act (published 2000-05-31, lastamended 2012-04-01), http://laws.justice.gc.ca/PDF/E-2.01.pdf[AS1] 

524. (1) Any elector who was eligible to vote in anelectoral district, and any candidate in an electoral district, may, byapplication to a competent court, contest the election in that electoraldistrict on the grounds that

(a) undersection 65 the elected candidate was not eligible to be a candidate; or

(b) there were irregularities, fraud or corrupt orillegal practices that affected the result of the election.

[…]

525. (1) The following courts are competent courts forthe purposes of this Part:

(a) a court listed in subsection (2) that has jurisdictionin all or part of the electoral district in question; and

(b) the Federal Court.

(2) For the purposes of paragraph (1)(a), the courtsare

(a) in the Province of Ontario, the Superior Court ofJustice;

(b) in the Province of Quebec, the Superior Court;

(c) in the Provinces of Nova Scotia and BritishColumbia, Yukon and the Northwest Territories, the Supreme Court;

(d) in the Provinces of New Brunswick, Manitoba,Saskatchewan and Alberta, the Court of Queen’s Bench;

(e) in the Provinces of Prince Edward Island andNewfoundland, the Trial Division of the Supreme Court; and

(f) in Nunavut, the Nunavut Court ofJustice.

[…]

Canada Elections Act (published 2000-05-31, lastamended 2012-04-01), http://laws.justice.gc.ca/PDF/E-2.01.pdf

71. (1) The returning officer shall, not laterthan 48 hours after a nomination paper is filed, give the prospective candidatenotice, in the prescribed form, of the confirmation of the nomination or of therefusal to accept the nomination.

[...]

(3) A nomination paper that a returning officer hasrefused to accept may be replaced by another nomination paper or may becorrected if the new or corrected nomination paper is filed with the returningofficer by the close of nominations.

369. (1) The Chief Electoral Officer shall, assoon as practicable after the day on which the application is received, informthe leader of a political party that has applied to become registered whetheror not the party is eligible for registration under section 368. If the partyis not eligible, he or she shall also indicate which of that section’srequirements have not been met.