I see you have an account under the same Adobe ID as with forums. I have checked your account details and noticed that you have 10 images a month(a year) plan which was purchased on 4th December 2017. Under this plan, services begin from the moment that you activate this trial period by submitting your payment details. You will not be charged for the first month’s billing cycle. You’ll be charged the rate stated above, plus applicable taxes (such as value added tax when the stated rate doesn’t include VAT), every month starting with the second month’s billing cycle for duration of your first annual contract.
If you cancel during the first-month billing cycle, your credit card will not be charged and your service will continue until the end of that first month’s billing cycle. If you cancel within 14 days after the beginning of the second month’s billing cycle, you’ll be fully refunded. 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.
For more information, you may refer to Legal subscription terms | Adobe
If you wish to cancel the Stock subscription kindly go through our help document Cancel your Adobe Stock membership
Additionally, I would like to let you know that you will lose access to your unused licenses, so, please download them prior to cancelling.
You may also contact our support team for further assistance: Support FAQ: How can I contact Adobe for support?
Hope this information helps!
Feel free to update this thread in case of any additional questions.