Charges and cancellations of a game

I have cancelled coloring book app I am still being charge this was a free app when I was playing Willy Wonka then the next thing I knew I was being charged weekly for an app I used one time. I would like to cancelled and then be reimbursed the funds that I have been charged. I think that u should make sure that someone knows when there is a charge for a game for sure when it is a weekly thing. Thank you Lisa