Sony Pictures Entertainment was the target of a massive cyber-attack that became public last month.
Pyongyang has denounced 'The Interview' as "undisguised sponsoring of terrorism".
Investigators are still combing for evidence to identify the culprit.
Sony executives have declined to comment on the scope of the attack.
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.