Dear {Name},
Thank you for notifying us of the recent overcharge on your card ending in {last four numbers}. On {date}, you should have been charged {amount} for {product} and you were mistakenly charged {amount} instead.
We apologize for the error and have refunded you the entire amount of your purchase. We have also {steps taken to ensure the error is not made again}.
Thank you again for bringing this matter to our attention, and I'm sorry for the inconvenience it caused you.
Sincerely,
{Name}
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Index of letter of apology templates