Look thru the following links and use the chat or phone option if required for your situation:
Cancel your membership or subscription | Creative Cloud
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).
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If you have an annual Creative Cloud Complete, Single App, or Photography plan and wish to cancel your membership then please contact our support team directly.