You should honestly just tell your credit card about this situation and if they are tier 1 (Chase, Amex, etc.) they will likely deny the charge on your behalf if you can show proof that you tried to cancel but weren't able to.
People can say they have you in whatever financial agreement, but if the processor has evidence you are NOT trying to pay it, they can at least stop it from going on their rails (and your card)
People can say they have you in whatever financial agreement, but if the processor has evidence you are NOT trying to pay it, they can at least stop it from going on their rails (and your card)