Here are some tips that the UK Government has for you on Free Trials? Notice that they don't say anything about guarantees through the Digital Rights Act.
https://competitionandmarkets.blog.gov.uk/2020/05/13/how-free-is-this-trial-tips-for-avoiding-unexpected-charges/
It is true that Free Trials must show clearly when they expire and when a subscription starts including the start date of that subscription. You will see all that information on the Approval screen when the free trial was started that required you to double click the side button to accept, followed by authentication with Face ID/TouchID or Passcode. In addition to that information, you also see the message that says to avoid the subscription charge you should cancel a day before the trial ends. That is a binding legal contract that you agreed to.
Failing to fulfill your obligations does not mean anyone has conned you. I recommend, and also the UK article linked above, to set a Reminder when starting a Free Trial. It is as easy as saying "Hey Siri, remind me on xx/xx/xx at yy:yy to review my Free Trial".
You still have the right to dispute the charge with your bank if Apple does not offer a refund, and the bank can issue a Chargeback to Apple and refund your money. Apple also has the right to limit further purchases made with that Apple Account too.
Also make sure you are following the correct procedure for requesting a refund using the Right of Withdrawal and make that clear to Apple. They don't offer refunds over the phone, so that is not likely going to get you anywhere.
https://www.apple.com/legal/internet-services/itunes/uk/rightofwithdrawal-uk.pdf
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