Dear {Name},
I'm so sorry we billed you wrongly for {service}. You were right. Rather than {amount}, you actually owe {amount}.
What happened was {reason for error}. The error was completely ours. Your account remains in good standing and your credit has not been affected. Your balance of {amount} is due {date}.
I hope that our error didn't cause you a great deal of inconvenience or stress. Our team is reviewing company billing procedures to avoid problems like these in the future.
Sincerely,
{Name}
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