To err is human and in case you have sent a wrong invoice to any of your customers then it is not enough that you send them the right invoice but what needs to be done is that you send an apology letter to them apologizing for your mistake.
In this post, we have come up with a sample apology email to a customer for sending wrong invoice. You can use this format for writing your own draft to your customer in order to apologize for your mistake of sending a wrong invoice.
Format for Apology Email to a Customer for Sending Wrong Invoice
Dear Mr. Black,
I am writing this email to inform you that the previous invoice that was sent to you is not meant for you as the invoice has some errors in it. On behalf of Zenith Technologies, I sincerely apologize for the inconvenience caused to you because of the incorrect invoice.
Please find attached with this email the correct invoice. The error in invoice occurred due to some glitch in our billing software and we are extremely sorry about it. We will make sure that such a thing does not get repeated in the past.
I hope that you are going to understand our situation. Thanking you for your patience and apologies for all the discomfort that was caused because of it.