Can transferred money by UPI be used to put a person in problem

My cousin paid money to me by the account of his lawyer friend to close a police case that I did through MHA to get from him that a USA based organization had transferred to another friend of him. Now, I don't have any document (affidavit) that I received the amount from him for the specific purpose, i.e. to close the case. So, now my question is - Can the friend of my cousin (in future) file a case that he borrowed money to him? What can I do now? They are cunning people and that is the reason I fear. Please help me by explaining the legal side? Regards Sunial