[Date]
[Name]
[Company and Address]
Dear ——–[NAME],
Allow me to apologize for the incorrect payment we made to you regarding your invoice # [Invoice Number]. Our check # [Check Number] for Rs. [Amount] is short of the total amount due, Rs. [ Amount].
Enclosed, please find our check # [Check Number] for Rs. [Amount], representing the difference between Rs. [Amount] and [Amount].
We have realized the error issue cause due to some technical problem in server.
Please accept my apologies and assurance that this will not occur again.
Sincerely,
(Name & Signature)