How to dispute unauthorized Apple Store autopay charge of HKD548?

I have been charged autopay by Apple Store this morning hkd548 , but I have not subscribe any app on Apple Store for that , money deducted without my consent . What can I do now ? So the hkd548 is deducted from my account without my consent for the Apple Store app on 13/2

I want my money back

[Re-Titled by Moderator]