I want to cancel my plan but I'm not allowed

Try using a different web device that accepts cookies and does not have script blockers.  Please log-in to your account below.  Click Manage Plans.  You must update payment details before you can cancel.
https://account.adobe.com/plans

If you still need help, scroll down to Contact Adobe on the same page. In the chat box type BILLING AGENT followed by enter key.  Online chat is available 24/7. 

Phone numbers & hours vary by region.

https://www.adobe.com/about-adobe/contact.html

===========
Beware of fake Adobe reps who may contact you privately offering to sell you software or take control of your computer. It's a scam, run away!
=============
3 Easy Ways to Identify Genuine Adobe Staff
https://tinyurl.com/10791730

SOME programs are available Monthly https://community.adobe.com/t5/Get-Started/Being-charged-for-a-full-year-when-i-m-on-month-to-month/td-p/10248222 - links and pictures

When you 'click to agree' to the subscription terms while buying a subscription, that means that you really do need to read BEFORE you buy a subscription... https://www.adobe.com/legal/subscription-terms.html
-LOTS of screen pics of the terms https://community.adobe.com/t5/Get-Started/Creative-Cloud-One-Years-Subcription-help/td-p/10379854 in reply #4
-Purchasing FAQ https://community.adobe.com/t5/Get-Started/Purchasing-FAQ-How-do-I-purchase-a-Creative-Cloud-membership/td-p/7431151

For phone numbers you can refer the following page

https://helpx.adobe.com/contact/phone.html

Be assured you will get the required resolution, why would they not allow you to cancel. I am sure you will be fine, in case you get no resolution then file a complaint with your bank and raise a request to block the payment. However i am sure it will not come to that.

Also be patient, due to the pandemic the wait times can be quite long for support

-Manan

Hello,

Sorry to hear that you are facing trouble but unfortunately you will not find the help you need at these forums. These are peer to peer forums and no one here has access to your account information. You will have to contact Support for the resolution of your issue. Click on the following link
https://helpx.adobe.com/contact.html
Make sure you are logged into your AdobeID, your browser has cookies enabled and no script blocker is enabled. Click on the chat icon on the bottom right.
Also be mindful of answering anyone who sends you a private message. See the following for more information about scammers
https://tinyurl.com/y7cfrr7y

-Manan