In a letter sent to streaming music giant Spotify last week, Apple general counsel Bruce Sewell has denied Spotify’s recent allegations that the tech biggie has been treating it unfairly.

Apple’s letter to Spotify has come in response to Spotify’s letter to Apple’s lawyers, after an update rolled out by Spotify to its iOS app was blocked by Apple. In its letter, Spotify described Apple’s refusal to allow its iOS app update as a “weapon” to thwart potentially substantial competition to the Apple Music service.

Spotify has further added in the letter that Apple’s rejection of Spotify’s iOS app update was causing “grave harm” to Spotify and its customers, and that the rejection raised serious concerns under antitrust laws. Spotify had also alleged that Apple had refused the app update due to its “business model rules” which require Spotify to use Apple’s billing system.

Firing back at Spotify’s claims, Sewell asserted in the letter to Spotify that Apple’s App Store rules are applicable equally to all app developers, and added that Spotify is seeking exemptions to App Store rules.

Sewell said: “We did not alter our behavior or our rules when we introduced our own music streaming service or when Spotify became a competitor. Ironically, it is now Spotify that wants things to be different by asking for preferential treatment from Apple.”