refund

I signed up for the free pro trial to use a feature for one piece and then immediately went to cancel the subscription, however my account said (and still says) that my card was declined so I was under the impression that I wouldn't be charged and didn't touch the account after. I just got an email saying I was charged $49 (even though it still says my card was declined) and I really do not have that kind of money (I'm a broke college student living off a scholarship) so I could really use a refund.