'You should also contact the magazine'
Which? expert Rubal Channa says...You were right to ask Santander to cancel the direct debit, and other readers should know that they can always cancel a payment with their bank, without permission from the retailer.
However, you should also contact the magazine to ask it to cancel the subscription to prevent it reinstating the direct debit, in case it thinks it was done in error.
When buying online, readers should look out for check boxes signing them up for subscriptions or services.
Generally, firms aren't permitted to use pre-ticked boxes to sign customers up for ongoing services or additional costs; an active choice must be made by the consumer. But it's always worth checking.
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source https://www.which.co.uk/news/article/how-do-i-cancel-a-subscription-service-that-i-dont-remember-signing-up-for-azEbO7l7Q6se