Reoccurring billing / automatic renewal of a subscription

Hello there.

So basically I have been charged 13 USD for a subscription in a game although I have canceled that reoccurring billing every month before they charged any money. There was no option to do it before that day for some reason. This happened on the 21st July.
Obviously I would not like to have to pay that money, mainly because I don't even play the game anymore nor do I have the gold subscription to even play online anyways. This money should not have been charged in my opinion. I did not have any money on that
account anyways. So now I have to pay those 13 USD or it will always renew itself every month? The complicated thing is that I live in Germany, Europe. We obviously don't use USD, we use Euro. I got a gift card from a friend that lives in the US. Bought the
subscription that time. Since it was 25 USD, I asked for one dollar so that I can get it twice. After the second month was charged I wanted to cancel the automatic payment for the next month, but it didn't let me. That makes it even harder to find a solution.
Not having the subscription at all would be much better, but they did it anyways.

Is there anything I can do to get rid of this issue? I could obviously pay that money, but I have no idea where to get 13 USD from since I don't have an US account with money. Altought I'd run the risk to have the same problem as previously mentioned that
I wouldn't be able to cancel the monthly payment.

:)