Illustrator plan cancellation

If you subscribed to Illustrator separately, log-in below with your personal ID & password.

https://account.adobe.com/plans.

Cancellation and refund policy

https://helpx.adobe.com/account/individual/terms-policies-and-regulations/adobe-subscription-terms.html

Hope that helps.

and you should be posting this in the account, payment and plan forum, https://community.adobe.com/account-payment-plan-4

p.s. change your title to avoid a duplicate message problem.

do you have an enterprise subscription?  if so, contact your admin, https://helpx.adobe.com/enterprise/kb/contact-administrator.html

if not, make sure you're aware of the cancellation terms by selecting your plan type (at the top of the page here), https://helpx.adobe.com/manage-account/using/creative-cloud-subscription-terms.html 

for info on how to cancel your subscription, this page describes the few steps involved, https://helpx.adobe.com/manage-account/using/cancel-subscription.html

if you want to cancel but are unable to follow the steps described in the "how to cancel page", you probably have a payment error that you need to repair before cancellation is allowed, https://helpx.adobe.com/manage-account/kb/fix-failed-missed-payment.html