Dramawave Charged Me Twice After Subscription Cancellation on Google Account

I am writing regarding my Dramawave subscription, which I cancelled via the app and my Google account on 6 August. Despite this cancellation, two further payments have still been taken from my account in Great Britain. I cannot provide a screenshot of my bank app, but the charges are clearly visible there even though my subscription should no longer be active. This situation is causing me financial inconvenience, as I believed the cancellation had been completed correctly through both Dramawave and my Google account. I request that my Dramawave subscription be fully cancelled without any further charges and that the two unwanted payments taken after 6 August be refunded in full. I also ask for written confirmation that my account has been completely cancelled and that no additional payments will be taken in the future.