I never understood that problem. Why can't you cancel the credit card used for the subscription? (Yes, it's a bit of a pain to move other subscriptions to another card, but also a great opportunity to clear out some other leeches.)
ianal - but I never understood that mindset. You're surely aware that a subscription is a contract, and terminating the payment method does not legally terminate it unless the company doesn't bother proceeding further?
Which may be the case for Adobe, but you're definitely in a legal gray zone in which I'm sure (again ianal) they can sue for damages if they want.