We like to think of ourselves as flawless when it comes to customer billing and service. But, as you point out in your letter citing discrepancies in your bill, we have made an error in how much we owed you for return of merchandise.
Please forgive us for our error. Even with our state-of-the-art customer billing software, it seems we are still fallible. I have spoken to the appropriate people, who have assured me that they’ve discovered the problem and corrected it. Regardless, the mistake is inexcusable and I will do everything I can to make sure it doesn’t happen again.
I am enclosing a check for the amount we owe you. Should you have any problems or need any service in the future, please do not hesitate to call on me.