Advertising agency Madison Communications has approached the Delhi High Court seeking to quash an ongoing antitrust investigation by the Competition Commission of India (CCI), arguing that its executives were questioned unlawfully during raids conducted in March without legal counsel present, according to court filings reviewed by Reuters.

Madison was among several major advertising agencies and broadcasters raided by the CCI earlier this year over alleged collusion on advertising rates and discounts, marking one of the regulator’s toughest crackdowns on the sector to date. Other agencies searched include WPP’s GroupM, Dentsu, Publicis, and Omnicom.

The petition, filed on 8 October, is the first legal challenge seeking to halt the CCI’s probe into one of the firms. In its 276-page filing

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