[Your Name] [Your Address] [City, State, Zip] [Email Address] [Phone Number] [Date]
[Company’s Name] [Company’s Address] [City, State, Zip]
Subject: Billing Error Complaint for Invoice Number [Invoice Number]
Dear [Company’s Name],
I am writing to bring to your attention…
[Explain the billing error, provide any evidence, and request a correction]
Thank you for your prompt attention to this matter.
Sincerely,
[Your Name]