Here we see an apology letter sample to customer\client in case of invoice or billing error from the company side. You are advised to modify this letter to be suitable for your purpose
Dear [Customer Name]
We would like to apologize for the error in your billing statement last [billing date]. Now, we have thoroughly checked our records and updated your account with the correct billing amount. The changes will be reflected on your next billing statement.
we hope this will resolve the problem to your satisfaction. Please don't hesitate to contact [insert name] at [insert telephone number] for more information about your account,
Thank you very much
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