You didn’t pay the levies prior to the due date, so the 10% discount didn’t apply. It is not up to the owners corporation or strata manager to alert you, how you pay the levies is up to you. The calculation basis on the later fees may be arguable, but it isn’t a matter of you being slugged with excessive penalties, you have just missed out on the discount. That is the $400 extra to which you are referring.