Asking a REFUND from Headway: Self-Growth Challenge

Hi, regarding the charges billed to me by Headway: Self-Growth Challenge, please help me to get my refund as I did not intend to buy their app. Yes, I subscribed to their free trial but after then, I immediately unsubscribed.

Thus, they should not be charging me! The funny part is they charged me for the whole year!

See screenshot below. They have to refund my money as I have not even once have used their app at all. It's not useful at all. and I even deleted it immediately.

Please update on this ASAP!