Free trial Cancellation

Definately not adobe express, sounds more like one of the CC plans.    You get charged if you do not cancel your plan within the aloted free trial time lime.   Lets say you got a 7 dat trial to the phtography plan, but you cancelled on day 8.  

Congratulations- you just learned an expensive lesson.

It will cost you 1/2 the contract time remaining to quit, in this case 6 months.

FOR EXAMPLE:  29.99 x 6 = $179.94 will be about the cost for you to you to quit.    It's in the contract you clicked over really fast when you signed up. 

https://helpx.adobe.com/manage-account/using/creative-cloud-subscription-terms.html#cancel