Cancellation guide: https://forums.adobe.com/thread/1703848
Chat support - For the link below click the Still Need Help? option in the blue area at the bottom and choose the chat option...
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800-833-6687 (US daytime only 5AM-7PM PST, Monday-Friday).
What i must do to cancel my inscription?
Please click the Accounts & Billing link here https://helpx.adobe.com/contact.html to have a chat with our billing support team.
You can also follow the steps in https://helpx.adobe.com/creative-cloud/help/cancel-membership.html