Compra errada

Hi @gustavo.caliri - This is expected because the free trial applies only to the plan credits available as per the plan you purchase . In this case you purchased Stock 10 plan , so the first 10 credits for the month, that you got with purchase is free during the trial period(nothing will be charged for those 10 credits use). However if you run out of those credits anything purchased afterwards will be charged. 

In this case , the first video cost 8 credits which used the 10 credits available in your plan and since for the next video purchase you didn't have enough credits available , it charged you  since this was out of the plan quota you had. This is expected. you will get a modal that says you ran out of credits and this purchase is going to charge $ XX before you confirm. and purchase.

Please contact customer care to see if they can help with refund in this case- 

https://helpx.adobe.com/contact.html

or contact Adobe customer care by beginning a secure chat session at  https://helpx.adobe.com/support.html

thank you !