You can absolutely have your package adjusted. Any package requires at least 200 dollars deposit. If you put more than the 200 on your package, then no you cannot get your deposit adjusted, but the rest of your package.
But, it sounds to me like you may have a room-only reservation. I tried getting the deposit adjusted to reflect the discount i put on my reservation but nope, whatever you paid for the deposit is whatever you paid, just the rest will be discounted.
The rooms are limited on some discounts. If your interested in a discount, I would call right away to find out.