Justin Bieber, Ariana Grande and their music manager Scooter Braun have all hit back at claims that their no. 1 on the Billboard charts this week was fixed.Rapper Tekashi 6ix9ine took to his Instagram account Monday to blast Billboard, and appeared to be suggesting that Grande and Bieber's charity single - which features Scooter Braun's first songwriting credit - reached the top spot unfairly.In his post, 6ix9ine (real name Daniel Hernandez) claimed that '6 credit cards used to buy 60,000 copies.
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