Miniplaylet Keeps Charging Me After I Requested Cancellation

I subscribed to the Miniplaylet minidramas service via a direct link on Instagram, and I am being charged 19.99 USD every week even though I have repeatedly asked for my subscription to be cancelled. I first requested cancellation on 19 July and despite this, I have been charged two more times since then, as shown in the billing emails sent to my address megan.m.thond***@gmail.com. The Playlet/Miniplaylet app does not recognise my credentials and does not offer me any alternative way to cancel the subscription. I have sent several emails requesting cancellation and assistance, but I have not received any reply and the weekly charges continue. I request that my Miniplaylet subscription be cancelled immediately and that all amounts charged since 19 July be fully refunded. I also expect a clear written confirmation that my subscription has been cancelled and that no further amounts will be taken from my account.