Hello bang68,
first you should have a look there, where you can find the several kinds of "membership": Adobe - Subscription Terms. To cancel it, you should use
https://helpx.adobe.com/x-productkb/policy-pricing/cancel-membership-subscription.html.
If necessary and for further questions click through http://helpx.adobe.com/contact.html and if "open" please use chat, I had the best experiences. I quote from Preran: The chat button is activated as soon as there is an agent available to help.
What concerns a tlephone number you can have a look there: "Telephone numbers of customer service and technical support Adobe worldwide" >>> https://www.adobe.com/eeurope/elicensing/licensemanagement/alm/contact.html (I used Europe's link, but that makes no difference.)
Good luck!
Hans-Günter