DramaBox Charged Me $9.49 After I Canceled My Subscription

I am a Drama Box user in the USA and I recently noticed that I am still being charged even though I already stopped using the service and deleted my account. I cancelled my Drama Box subscription via Google Play in August and removed the account, yet I was still charged 9.49 through Google Play afterward, as shown on my bank statement. I kindly request that my account and subscription status be checked in detail, that any remaining active subscription linked to my information be fully cancelled, and that no further payments be taken from me going forward. In addition, I am asking for a full refund of the 9.49 that was charged after my cancellation and for clear written confirmation that my subscription has been completely cancelled and that there will be no more charges from now on.