Dear

On [date] , this office mailed to you a check
in the amount of $ per your [date] invoice.

After reviewing your file, I realized that this account
had been paid in full on [date] I am enclosing
a photostat of our cancelled check # in the amount
of $

I would appreciate it if you would reimburse this office
for the duplicate payment. I apologize for any
inconvenience this error has caused.

Thank you for your prompt attention to this matter.

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