I agree you should contact the sales rep asap. It almost appears as though you were never fully qualified to purchase the home as far as a pre-qualification was concerned. Also not to dash your hopes but please have a back-up lender as WF tends to make blanket statements such as the credit scores that are acceptable and when the file is sent to UW it is denied almost instantly.
Starting Score: 06/2011 505 EX 523 Lender Pulled