Usually I’m pretty “anti-law”. That is, more laws are not good – especially around software. However, with more and more scams coming online, there ought to be a law which is quite simple. If you allow someone to signup for a recurring-billing product online, you must also provide a simple way for that user to cancel the service online. Like most of us, I accidentally got sucked into one; and now I can’t get out. I knew I was treading on thin ice when I signed up, and now I am really regretting it.
Try going to your profile for the service, and remove your credit card number or set the expiration date to before the next billing.