A law firm in China has filed a new antitrust complaint accusing Apple of abusing its control over iOS app distribution and payments, escalating a dispute that previously failed in civil court by seeking action from state regulators instead, Reuters reports.

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The new complaint was submitted to the State Administration for Market Regulation (SAMR) on behalf of 55 Chinese iPhone and iPad users. The filing alleges that Apple maintains a monopoly over iOS app distribution in China via the App Store,…