I signed up for CC InDesign. I was beaten down by offers for the Stock trial. I didn't want Stock. I have not used Stock for more than one photo. I was automatically enrolled into a one year subscription. I've paid out several months on something I never wanted and now you want to charge a cancellation fee? This is a questionable practice and borderline fraudulent. How can you esteem yourself as a reputable company whilst engaging in such dubious practices?
With the Stock promotion you are signing up for an annual plan and can cancel risk free within the first 30 days. As per the subscription terms & conditions, if you cancel after this time you'll be charged 50% of your remaining contract obligation & your service will continue until the end of that month's billing period.
I have responded to your private message as well.