Speak with a real estate attorney; you may have a cause of action for improper eviction. If you failed to make payments under the contract, that would be a breach, and that would give the landlord grounds to evict you, as failing to pay under a lease provides grounds for eviction. However, as a general matter, eviction must be done through the courts and legal system, using the proper procedure. (Notice; then if you don't leave, file a Summons and Complaint; get a judgment of possession; then get a warrant or writ of removal.) I do not believe that other mechanisms can be used to evict, whether the grounds are breach of lease, breach of a contract to purchase, foreclosure, etc. Since you may have a cause of action, it would be worth consulting with an attorney. Good luck.