Unauthorised Membership Charges & No Way to Remove My Card

I am extremely disappointed with eDreams. I am being debited for a membership/subscription that I do not recall knowingly signing up for, and what makes this even more concerning is that I am unable to update or remove my card details from their system.

How is it acceptable for a company to continue charging a customer while not providing a clear and accessible way to cancel the membership and remove their payment details?

This feels extremely unfair and, quite frankly, ****-like. If I did subscribe to a membership, I should be given a straightforward way to cancel it and remove my card. I should not have to fight with a system to stop recurring charges.