Unfortunately, since the house was sold prior to you executing a lease your landlord did not have the right to rent it to you and the lease is invalid. You should contact the police who may be successful in locating the landlord and give you some hope of getting your money back. Your best bet would be to work with the bank to try and get some time to move out. HIre an attorney, or if you can not afford one try and get legal aid society to represent you, to negotiate some time to get out.
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