I signed my daughter (student) up for Adobe Creative Cloud and was offered Stock for FREE with my creative cloud membership...then I was charged $29.99 for 2 months. When I realized I had been receiving charges, I canceled Stock only to be notified I would be charged a cancellation fee of $134! ALso the message about the cancellation fee just flashed on my screen and disappeared..which is very shady. Tried contacting customer support TWICE...no help.
The offer is that when you sign up for the Adobe Stock 10 images/month plan you get the first month free and can cancel risk free within the first month. Otherwise, the plan renews on a monthly basis as per the subscription terms.
The support team are dealing with your case and will update you when they have further information.