Invoices are generated as a part of an automated billing process that is very well tested. This process has been successfully generating accurate invoices over a long period of time. So the scenario that you may encounter an issue with the invoice, would be quite rare.
However, if you encounter an error in any such rare instance, then please write to us at email@example.com with a description of the issue. Our team then quickly reviews the issue, reverts with a feedback, and work with you to address the issue.
As a follow-up process, if there is a requirement for a modification of the invoice, the same is handled in the form of a credit note or debit note. We cannot make any modifications to the already generated invoice, hence we take this approach.