Dear _________ (Name),
This email is in response to your complaint regarding ___________ (wrong information/wrong document/any other). I am writing this email to formally apologize to you for the mistake and I regret the inconvenience it may have caused to you.
I would like to notify you that due to ___________ (mention reason – mistake/miscommunication/technical error/any other), you have received the wrong attachment. I assure you that you will receive the correct document within ____ (minutes/hours/days) to avoid any further trouble.
Thank you for your understanding and cooperation. If you have any questions or concerns, you can always feel free to contact me at __________ (contact details).
Regards,
___________ (Name),
___________ (Contact details)
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