I have received a
exaggerated*overestimated? incorrect? excessive? electric bill for the month of August 2010. The due date for payment is 8th September 2010.
I would like to inform you that
my whole**I? my whole family? was out of the country for the whole month of August. Please check your records properly and issue me a fresh bill for the correct lesseramount.
As you know I have
been payingalways previously paid my utilities bill in timepromptly, so please send me yourthe new bill before the due date to enable me to pay it in time.
*How is your bill calculated? Have they sent you an estimated bill which is simply too high? (in which case use "overestimated") or do you normally pay a fixed rate which should have been lower because the property was empty? (in which case use "incorrect").
**Who was actually away? "my whole" doesn't mean anything without a noun of some kind; family sounds most likely but it will depend on your circumstances of course.
Student or Learner