Kgosientso Ramokgopa said services were expected from Minaj and the money paid to her should be refunded.
Sony's PlayStation network is back online after a cyber attack over the weekend.
Sony has sold more than 7 million PS4 videogame consoles in just over four months.
Sony said it would make the headset available to game developers soon.
The Tokyo-based trader said Nintendo was also benefiting from a weaker yen.
Sony plans to launch PlayStration Now, a service that will stream games remotely from a cloud-based server.