If you block a payment with your bank or credit card the other end can attempt to charge you anyway. You can sometimes dispute and lose and still pay. It also

If you block a payment with your bank or credit card the other end can attempt to charge you anyway. You can sometimes dispute and lose and still pay. It also can trigger negative repercussions if you do have an ongoing relationship with the company, like IIRC Steam locks your whole account if you go that path on the basis that it indicates fraud to be blocked (not just that you wanted to cancel)