We all know how you feel. MOst of us have been there and are trying to get out lives back in order.
YOu have every right to be angry at both the scammer and the system for letting you down- but- for now, the rules say if you took out the money, you have to pay it back.
The worst person involved was the bank manager. He should have been more aware of the scam and more sympathetic to your plight as you were just trying to sell your rabbits- not get away with anything.
Is this the only bank you can use? If this is a branch of a larger bank, I'd report his behavior to the CEO or President. Yes, he was within his rights to ask for repayment and to make arrangements with you- but his atitude was unprofessional and cruel.
If you report him, make sure your letter is worded diplomatically so you sound like a good person and he is painted as the bad guy.
YOu can use
http://www.bankersonline.com to see what banks are encouraged to do when they discover a fake from the Nigerian counterfeiters.
Shaming the depositor is not on the list!