We're sorry for the delayed response and inconvenience caused. As per the description above, you want to cancel Adobe PDFPack subscription, Is that correct?
For the cancellation, you can refer to Adobe article Cancel your membership or subscription | Adobe Acrobat, Document Cloud PDF services You can also refer to How to cancel your Adobe Creative Cloud plan or membership
You can also contact the Adobe support team via Contact Customer Care
Feel free to update this discussion for any further assistance.