Basic import
Currently, no support.
Extended import
The extended import gives the possibility to invalidate the selected contact, based on the contact number.
Applicable to all contact (even if it has bought something).
The details and more fields are found here: Contact import Format (Extended).
How to update
- Request a service to get a list of contact with contact numberin an Excel file
- Filter the list of contact to have a list of contact you're no longer want.
- Request a service to invalidate the contacts with the modified file