Branching to a new discussion,
Sorry to hear that you are facing issues while cancelling your Adobe Stock subscription.
I have checked your account details and noticed that you had signed up for Adobe Stock 10 images per month(1-year plan) on 10 Sep 2018.
You can now self-cancel your subscription, please see the help document to understand the workflow: Cancel your Adobe Stock membership
You may also reach out to the support team Support FAQ: How can I contact Adobe for support? for the cancellation requests.
Hope this helps!
Feel free to update this thread in case of any additional questions.