To receive your refund back you would need to contact the Disney site that you make the reservation with. They can tell you the rules and regulations of how to get your deposit back if possible.
it depends on how you paid. it is refundable however there is a good chance that you will not recieve all 200 dollars back and you may only recieve like 140.
Disney tends to go with a no refund policy no matter the time ahead that you try to cancel. You might be about to get all but one night refunded but it is doubtful.
It totally depends upon the terms of the contract you entered into when you made the deposit. Some are, some aren't - a good reason to read the fine print.