Apology to Customer for Accounting Error

Dear

Thank you for your recent correspondence regarding your
account number ____________. We were able to track down
the error and have credited your account accordingly. A
report to this effect has also been sent to our credit
reporting company.

As of this date, your account balance is $_____________.

You are a valued customer and we apologize for any
inconvenience this mix-up may have caused. If we may be
of further assistance please contact this office at your
convenience.