Musecore Subscriptiin

Hello,
About a month ago I signed up for the free trial on musecore pro and was not satisfied. I attempted to end the subscription before I was billed and it told me that the subscription was cancelled. About a few hours ago I received a charge for the subscription I cancelled. Is there any way this can be undone. I don’t think it is fair that I cancelled this and I am being charged money I simply do not have. As of right now I don’t have a job and I am trying to save every penny I have just to afford to eat and it may not seem like much but $50 to a college student is a lot of money. Is there any possible way this can be undone.