Free trial scam

So did it immediately charge you or did it do it at the end of the 7 day free trial? If you didn’t cancel it in time it was supposed to charge you (which might be why Apple is saying you can’t get a refund). You may be able to dispute the charges with your bank BUT if the issue is you didn’t cancel the subscription in time then the charge is legit and your bank will not overturn the charges. They’ll know based on when you started the trial and the date the subscription was charged.

Request a refund for apps or content that you bought from Apple - Apple Support

Canceling a subscription is effective at the next renewal date.

See or cancel your subscriptions - Apple Support