Branching to a new discussion,
Sorry to hear that you are facing troubles while cancelling your Stock subscription.
Please confirm if you have tried to follow the steps as mentioned in the help document in order to self-cancel your plan: Cancel your Adobe Stock membership
Additionally, I would also like to inform you that if you cancel the service after the 14th day after the beginning of the second month’s billing cycle, you’ll be charged 50% of your remaining contract obligation and your service will continue until the end of that month’s billing period.
You may also reach out to our support team Support FAQ: How can I contact Adobe for support? for cancellation requests.
If you still face troubles, feel free to update this thread so that we can further assist you.