Perhaps your local newspaper, or television station may have an interested in a story where a builder is selling properties at one price, holding the mortgage and lowering the price to sell similar product.
Without knowing specifics, there are some options:
1. Stay put and continue paying your mortgage then when the housing market recovers you may decide to sell
2. Consult an attorney to read over the legally binding contract(s) which has already been mentioned
3. If you are considering moving and selling then you may be able to contact your lender and ask if they will accept less than what you owe on the mortgage (i.e. short sale) then use the proceeds to buy another house elsewhere.
You have no alturnnative except to seek legal advise from a real estate specialist to evaluate your options.
If you need a referral please give me a call
ReMax ACR Elite Group, Inc
727. 420. 4041