Sample Apology Letter for sending Incomplete Information

Dear [Customer Name],

I'd like to apologize for sending you the incomplete information on [insert subject]. There was a slight miscommunication on our end. I have now thoroughly checked the details and I am sending you the correct and updated information with this email.

I'm sorry for any inconvenience this may have caused. I appreciate your understanding. Please call me if you have any questions. I can be reached .

Sincerely,
[your name]