Sorry to hear about the frustrating experience.
We have looked into your account and found that the cancellation for Adobe Export PDF service has now been done successfully.
If there is any further assistance is required, you may contact to our customer care billing team for further assistance.
Or you may simply refer to the link- Troubleshooting Create PDF, Export PDF, Adobe Send, Fill & Sign … services(PDFPack or Document Cloud...
Do let us know if there is any further assistance is required.