Sunniva, to cancel membership kindly contact our support team via: http://helpx.adobe.com/in/contact.html?step=CCSN_adobe-id-signing-in_stillNeedHelp
If you are unable to use chat option kindly try below mentioned steps.
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You can also try: http://helpx.adobe.com/x-productkb/global/phone-support-orders.html
For more info on cancellation: https://helpx.adobe.com/x-productkb/policy-pricing/cancel-membership-subscription.html
Atul_Saini