Good evening, @stheobaldKS.
Welcome to the Community!
Based on the details you gave and the results you'd like, we recommend contacting Biller Genie for some insight on how to properly do this action. Since the customer is receiving the invoice from the Biller Genie software, it would be best to get in touch with them.
Please let us know how the conversation goes with Biller Genie. We want to ensure that you get this taken care of as soon as possible. Have a great day!