Cancel Subscription And Refund

I live in the UK and recently saw an advert for a Sweetmax offer on Facebook. I clicked on it from my Android phone and paid the initial low price of £5.99 for a 7‑day offer on 12/10/2026 using my Barclays bank card. After this trial, I tried to cancel the subscription, but there was no clear way to cancel it and now I cannot even access the Sweetmax site. I have also checked my Google account and could not find any active subscription or option to manage or cancel anything related to Sweetmax. Despite my attempts to cancel, £28.99 has been taken from my account today without my consent or approval for any ongoing subscription. I have not yet contacted my bank because I am first trying to resolve this directly through this complaint. I request that the ongoing subscription be fully cancelled, that no further payments are taken from my account, and that the £28.99 charged today be refunded to me.