SG*OriginalPlus subscription charge? - Apple Pay Wallet

I received an emailed receipt for £29.99 from SG Original Plus for a subscription i never ordered. my current account was debited £29.99. the transaction appears in my apple pay wallet but I have no idea how it happened. Does anyone have any suggestions? Somehow, this company had my email address, and the receipt they sent me by email specified that I had purchased a subscription for one month - with a start and end date. I have no idea where this all came from. I didn't seek out this company - I have no interest or knowledge in or of them, and I never gave any personal details to them at all - or purchase instructions. However, according to the payment history in my Apple Wallet, I payed £29.99 to them at 12.59 on 5th Oct but I wasn't even using my phone at this time. What is going on?

[Re-Titled by Moderator]