Sorry for your troubles. It's typical in a bank-owned situation that two things are true.
1. The bank reserves the right (usually stated in their bank-owned property addendum) to withdraw their acceptance of any offer and take a different, better offer.
2. The deal isn't intact until you and the bank have signed all documents and the earnest money has been received by the Listing Broker or bank.
I'd encourage you to communicate with your agent to discover where in the process your offer was derailed, and the re-consider your options.
Principal Broker, REALTORÂ®
MacDuff Realty Group, LLC