APOLOGY FOR INCORRECT PAYMENT: UNDERPAYMENT

Dear Felix

Allow me to apologize for the incorrect payment we made to you regarding your invoice #[INVOICE NUMBER]. Our check #[CHECK NUMBER] for $[AMOUNT] is short of the total amount due, $[ AMOUNT].

Enclosed, please find our check #[CHECK NUMBER] for $[AMOUNT], representing the difference between $[AMOUNT] and [AMOUNT].

Please accept my apologies and assurance that this will not occur again.

Regards
Lydia