I am having the same problem and I have tried everything to cancel, but it isn't clear, or showing in My Plans because its not a Direct Debit, its a card payment.
I also have done the free trial and only used a few images. I have tried to call the number 888 649 2990 from UK and it doesn't work!!!
Someone PLEASE HELP!!!
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(one-year) plan on 13 Jul 2018. The subscription has already been cancelled.
Also, when you subscribe to the Adobe Stock promo offer, the first month is a free trial, Adobe doesn't charge you for the 1st month; the subscription billing actually starts from the second month.
For more information, please see Adobe Subscription and Cancellation Terms | Adobe
Feel free to update this thread in case of any additional questions.
So why have I been charged in September?
Since you have signed up for the Adobe Stock subscription on 13 of Jul 2018(the first month was a free trial), you were not charged on July 13th. You were billed on the second month for both the months-August and September (Amount: 23.99 GBP) until the subscription was cancelled.