FOR PRICELINE RESERVATIONS WITH BOOKING FAILURECall Priceline 1800-259-2091 dial 3 and then 1 and ask for the contract receipt.
Then fax the contract to Delta with your name, email and phone number to 1801-575-3000
UPDATE: It is no longer necessary to fax in anything to Delta. Just call Delta direct, with the priceline conf number, ask for a supervisor, and they are honoring all tickets!