patty: what school is that? seems like most schools ask for deposits at the end, beginning or the 15th of the month.
cls did say they were going to give out responses to all those held by april 15th. assuming they keep their word, is it too late for you to hear tomorrow? alternatively, you could ask the school requiring the seat deposit for an extension (by 1 day).
i would just be a little wary contacting admissions offices about this, since they already firmly said by april 15. just my 2cents.