When I mailed in my final payment, I realized I put the decimal point in the wrong place. This is quite the error and I apologize for not paying more attention to what I was writing. I would appreciate you refunding the remaining amount after my account balance is paid...
Dear (recipient's name),
When I mailed in my final payment, I realized I put the decimal point in the wrong place. This is quite the error and I apologize for not paying more attention to what I was writing. I would appreciate you refunding the remaining amount after my account balance is paid in full.
Thank you,
(your name)