You can cancel scheduled card collections that have not been triggered before the collection date. There are 2 ways to go about this:
Cancelling specific card collections in View Scheduled Collections:
Click on the main menu.
Select “Collections” - “View Scheduled Collections”.
Search for the scheduled card collection(s) you wish to cancel.
Similarly, on the right, click on the Cancel Schedule icon to cancel the collection.
Click “Yes” on the pop-up window to confirm.
You can also temporarily disable upcoming Scheduled Collections by following the step-by-step guide here.