The battle between Apple and Epic continues to heat up, with the news that Apple has filed a lawsuit against the Fortnite developer.

In the application, Apple's lawyers write that Epic has violated its contract with Apple and has caused financial damage by charging customers in unauthorised ways. Apple is seeking compensation for that damage, and wants the court to ban Epic from using its own payment systems in Fortnite and all other apps on the App Store, reports CNBC.

In a statement submitted with the lawsuit itself, Apple writes that Epic is trying to portray itself as "a modern corporate Robin Hood, [but] in reality it is a multibillion-dollar enterprise that simply wants to pay nothing for the tremendous value it derives from the App Store".

The two firms have been busy devising multiple avenues of attack on one another. Earlier this week we reported that Epic had submitted a preliminary injunction asking a court to force Apple to put Fortnite back on the App Store (it was removed in August) and give back access to its developer account (which Apple closed last week).

The dispute centres on Apple's 30% cut of revenues from the App Store, and Epic's use of alternative payment methods to bypass this cut.

This article originally appeared on Macworld Sweden. Translation by David Price.