Card Blocked because of fraudulent debit while frozen

On 27/4, I subscribed for a $1 - 7 days trial to hiphorallybeatschool with my virtual card. After seeing the content, I cancelled my trial on 27/4 itself.
On May 4th, they tried to debit my frozen card of $38.60. Now I cannot unfreeze my card unless I accept this payment.
How to reject this fraudulent payment?
How to solve this situation?
How to cancel authorization request?