Charged me money after I cancelled my trial subscription BEFORE it ended

I subscribed to adobe pro around an hour ago. However, I realized that the features were lacking and I CANCELLED the subscription after a few minutes of using it. BUT, I just checked my email and it claims that Adobe has CHARGED me 8HKD for their services. I need a refund for the 8HKD.

For those who cannot read:

I HAVE ALREADY MADE SURE I HAVE CANCELLED ALL SUBSCRIPTIONS of ADOBE.

I LOGGED OUT OF MY ACCOUNT AND LOGGED IN AGAIN AND DOUBLE CHECKED THAT I HAVE NO ACTIVE SUBSCRIPTIONS LEFT.

I HAVE CONFIRMED I HAVE UNSUBSCRIBED TO ALL SUBSCRITIONS BY READING BOTH EMAILS FROM ADOBE DETAILING THAT I HAVE SUCCESSFUL CANCELLED ALL MY SUBSCRIPTIONS.

DO NOT TELL ME ABOUT THE TRIAL TERMS. I UNSUBSCRIBED WITHIN 15 MINUTES OF SUBSCRIBING, SO DO NOT TELL ME THAT I ALREADY EXCEEDED THE TRIAL PERIOD.

PLEASE HELP ME REFUND.