Letter of apology for billing error

How to write apology letter against complaint received for billing error 

[Recipient Name]
[Title]
[Company Name]
[Street Address]
[City, ST  ZIP Code

Dear [Recipient Name]:

Thank you for your letter of [click here to enter a date] describing your concerns regarding the balance of your account, number [account number]. In evaluating our records we have located an error and have corrected it. You’ll see this correction reflected on your next billing statement. In addition, we’ve notified our credit reporting agency of the correction.
As of the date of this letter, your account balance is $[account balance].
We appreciate your business and apologize for any inconvenience that this error may have caused. You’re a valued customer, and we’re committed to providing you with the best service possible. If I may be of further assistance to you, please contact me at [phone number].
Sincerely,
User

[Title]

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