I've upgraded to the all inclusive Creative Cloud package from a Premiere Pro subscription. Both are monthly payments, but with an year-long contract. I did a separate upgrade by accident (as I'm a single person, I don't need two subscriptions).
I'd like to cancel the Premiere Pro subscription without paying any extra fees as I'm actually upgrading, not canceling. I could not find any real-life support channels under https://helpx.adobe.com/contact.html (shame on you!)