I have been paying for a subscription I didn't have
I think I might have signed up for the free trial of Apple TV+ sometime at the end of last year, but I cancelled it before the payments started (I thought!). But now I see the payments started anyway, but I haven't had access to AppleTV+. So they've been charging me for something I haven't been getting. I also, obviously, couldn't cancel the subscription I did not have to make the payments stop.
How do I deal with this, how do I cancel these payments and how can I get my money back for services that were not delivered?
MacBook Pro 16″, macOS 13.4