An online electronics company which topped the NSW Fair Trading complaints register several times last year has been handed more than $3 million in fines by the Supreme Court of NSW.

Android Enjoyed, as well as its sister company CameraSky, racked up 637 complaints from shoppers between 2017 and 2018, before shutting down in August.

Massive fine: The homepage for the now-closed Android Enjoyed.

"Complaints received indicated that on numerous occasions, Android Enjoyed and Camera

Sky failed to supply mobile phones, cameras and camera accessories within a reasonable

time or did not supply them at all," NSW Fair Trading Commissioner Rose Webb said.

"The company further failed to repair defective goods and failed to provide a refund within a reasonable time.