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I am sorry to hear this.
If you can prove that they mis-represented what the contract included you may be able to succeed if they sue you. That is also the case if you can prove that they breached the contract either in not performing their services adequately or because of how they treated you.
But you do need to retain a lawyer at once. It is not correct that they cannot get anything if you are on disability. They can force a sale of the house that you bought and get what is owing to them from the equity.
You can retain a lawyer that does civil litigation.