I had the issue with the WSJ. I couldn't believe it was so hard to cancel. My solution was to update my card with an incorrect number, they canceled the subscription after the payment was declined.
So any third-party vendor on Amazon has enough? Fantastic.
We badly need much stricter privacy rights surrounding personal information, but I don't see a viable political path to making it happen sadly :(.
I live in a different country / time zone, wasn't unsure how long it was going to take and if my phone would be charged. Also English isn't my native language and it adds to the burden of having to call them.