Sky Network Television and Vodafone New Zealand have detailed their appeal against the Commerce Commission's decision blocking their merger.
The companies argued the regulator was mistaken to find the combined group would substantially lessen competition, and the ruling should be reversed.
The pay-TV operator and telecommunications group filed an appeal against the Commission's ruling in the High Court in March, to give them time to consider the regulator's reasoning against the decision.
The Commission published its reasons last month and the two companies amended their appeal in documents filed with the High Court yesterday.
The competition regulator rejected the $3.44 billion merger, citing concerns about the combined group's ownership of all premium sports content, which it could then bundle up into a single mobile, landline, broadband and pay-TV offering.