Is this free trial prank?

I requested for just Adobe Illustrator 7 days free trial. But after 7 days, you paid for it without any notification for me about it. This is going wrong. I know that I don't pay for any free trials after they end and it's a common sense. Unless I should have gotten an informaion about your memberships and how to avoid paying for it. I didn't want to pay for Illustrator after free trial. I would like to get my refund immediately also specific information about my refund and how to cancel a membership. I didn't use my Illustrator after 7 days free trial ended. I hope I can hear some good news