Hello Marianag,
We apologize for the inconvinience caused, as per the description above you want to cancel the AdobePDF pack which is active with your Adobe ID, Is that correct?
Please refer to the following KB doc and open it on a different browser like Chrome, or Firefox, or Safari Cancel your membership or subscription | Adobe Acrobat, Document Cloud PDF services || Link https://helpx.adobe.com/document-cloud/kb/cancel-subscription-acrobat-online-services.html
If the issue persists, you may contact the Adobe Support team through Contact Customer Care Link: https://helpx.adobe.com/contact.html
I have also sent you the direct contact number of Adobe support via Private message, please check your email inbox.
Hope this helps, and let us know how it goes.
Regards,
Anand Sri.