By default, all billing-related communications happen to all the admins of your account. You can make a user an admin by following the steps here.
Non-Admin/Non User: If a Person/SPOC is not a user of the account, You can add the Email ID of the SPOC (if they are not an admin)in the Service disruption Email and Bill Email Address Section to receive downtime and Billing related notification emails
And, by chance you want billing communications to be done to your billing department or if you want the service disruptions/downtime emails to go to your tech department, you can do so by specifying these emails in a comma-separated format here: http://my.exotel.in/cinfo.
If you have any questions or concerns, please connect with us using the chat widget on your Exotel Dashboard or Whatsapp us on 08088919888.