Dear Felix
I am writing to request that you discard our statement of [DATE, June 1, 1998] as we have made a mistake. [STATE NATURE OF ERROR, ex. Namely, that statement fails to reflect your payment of $12,232.23 on May 15].
Enclosed, please find a corrected statement, showing a new balance of $[AMOUNT]. Please accept my apologies for the error and any inconveniences it may have caused.
Regards
Lydia