Incorrectly subscribed for annual HoiChoi

I incorrectly signed up for an annual subscription for Hoichoi. I did not want to sign up for this, it just happened less than an hour ago. Please have the subscription cancelled and charges reversed. I already contacted support@hoichoi.tv and they said they can cancel the subscription but the charges have to be reversed by apple only. Please help me out as I cannot afford this over $100 charge at this moment. Please cancel the subscription.