Cancellation Of Unknown Subscription

I have received an unwanted direct debit charge of £14.50 from Dramawave through my Barclays account, even though I do not have any active subscription that I can see or manage. I only remember making a one‑off purchase of coins in the past and did not agree to any recurring payments. Recently a £14.79 payment attempt was even declined due to insufficient funds, which made me realise that there appears to be some kind of ongoing charge set up without my clear consent. I have tried to locate any Dramawave account or subscription linked to my details but I cannot find any active plan to cancel, especially on my Android device where I use Google services. Because I cannot see the subscription anywhere, I am unable to stop these attempted direct debits from being created. I request that my subscription, if any exists in Dramawave’s systems, be fully cancelled and that any recurring or future charges to my Barclays account be permanently stopped. I also ask that you confirm in writing that there are no active subscriptions remaining in my name or linked to my payment details.