I need my money back for subscription that was not for me and I didnt use at all

Hello, my brother asked me for a card to buy a subscription on your service. He registered for the first time here and entered a promo code for a month of free subscription to try it, it said 0 dollars, and the subscription will cost 100 dollars only next month after the test, and he said he will pay for it himself. But for some reason my card has been charged 100 dollars already now, I would like to ask you to refund me the money and delete all subscriptions and account if it requires it since I signed up only 20 minutes ago and did not use anything on this service. Sorry about that but still, I just have 38 pounds left on my card and I need to live on it for a week.