Company supposed to return the money is untraceable

Sir, We are in a really bad situation. My father is above 70 and has had some issues focusing on things. A company called Apurva approached him and told him that they need a collateral for their company loan for 5 months after which they would return the collateral. My father was given some money (less than 5% of the home value) for this arrangement. The Bank manager at one of the biggest banks in the country also colluded with the company and convinced my father that the company is legit and they do this from time to time. My father agreed to get into a contract. The issue aroused when my father after the term of the contract asked back for the property. The company started making threatening calls to my father. There has been no relief from the bank. Now, my father is fighting a court case (both the bank the Apurva as parties that cheated him) to save the house, after the bank issued eviction notice. Apurva is untraceable.