Dear {Name},
I am so terribly sorry that I forgot to check on your {order/account/property/etc.}. I realize that {inconvenience/expense} to you resulted from my oversight.
I hope you know that my neglect to follow through was not intentional. If not for {unusual personal or professional situation}, I'm certain I would have remembered.
If you've lost trust in me due to this, I completely understand. And my offer to {compensate in some way} is still open. Please take care.
Sincerely,
{Sender}
Download this apology letter template — free!
Formatted and ready to use with Microsoft Word, Google Docs, or any other word processor that can open the .DOC file format.
Index of letter of apology templates