Adobe stock 10 "free" for one month - Auto-renewal and no refund

I am a college student and a creative cloud subscriber. I noticed what I thought was a promotion for "10 free stock images" in December on the creative cloud app, and decided to use two. I thought that was the end of it, but just recently checked my adobe account and saw that I had unwittingly been subscribed for adobe stock starting in January, for $29.99/month. I had absolutely no knowledge of this subscription, and when I check my past emails, I only ever received a confirmation of payment (not of subscription, not even of purchase) in January that ended up in my spam folder-because it wasn't from Adobe's usual email addresses which I've added to my contacts-with no following emails since. When I called to get a refund and explain my situation-which is obvious from my records since I only ever used those two images in December - the only offer they could give me was free three months on my subscription out of "good will," which I'll have to remember to cancel in November since they charge you if you cancel any sooner.

I'm livid that this subscription, which was offered as a one-month promotion, was continued without my knowledge or intentional approval, and that costumer service couldn't offer one shred of understanding and refund any of the $150.00 I unknowingly paid for images I have absolutely no use for since I'm a photographer myself and prefer to shot my own work and placement images, and will apparently need to pay more so that I'm not over-charged.