Sweetmax Drama Unauthorized Charges and Refund Request

I have discovered two unauthorised charges for a “Sweetmax Drama” subscription that I never signed up for, and I am requesting urgent help in resolving this. On 27 August I was charged £3.87, and on 2 September I was charged £18.48, both taken from my Santander Visa debit card. I have never knowingly subscribed to any Drama service with Sweetmax, nor have I given consent for these payments. After noticing the charges, I tried to locate the relevant app or service on Google Play in order to cancel any possible subscription, but I could not find it. I also attempted to contact you by email, but I have not received any reply so far, and I am still unable to cancel or manage this supposed subscription through my bank. I request a full refund of both charges (£3.87 and £18.48), immediate cancellation of any subscription linked to my details, and the blocking of any further charges to my Santander Visa debit card in relation to this service. I expect this issue to be investigated and resolved promptly, and I ask you to confirm in writing that the subscription has been cancelled and that no further payments will be taken.