my payment method failed because i accidentally tried to buy staff using my debit card which didn’t have any money in it and now i can’t cancel the subscription because i can’t find it

my payment method failed because i accidentally tried to buy staff online using my debit card visa and now it saying payment failed. how do i cancel that purchase without updating the balance because it will take the money without me getting any of the staff that i tried to buy .. also i can’t cancel subscription from my settings because their nothing their