Got legal notice from my friend to repay friendly loan of Rs.57500

Dear Sir In January'17 my friend gave me Rs.102000/- for business named as Ablaze Info solutions another name was social trade that was MLM company at that time he was agree with each and every terms and gave me the money through online. I used only 57500 for one ID and balance 44500 was return to him after 1 week. But unfortunately the company shutdown at same time and 3700 cr was looted from the all over india that was national news. But now my friend sent me today legal notice to repay his loan amount since he nothing his mentioned about company and any type of business.he is trying to covert this case to in friendly loan case and mentioned that i'm threatened him to kill so i'm fed up with these false statements. Since i received his money by online and no loan agreement was done between us. I have only his adhaar card pan card, copy of cheque which was produced by him for kyc in Ablaze info solution I have screenshot of transferred amount of Rs.57500 to ablaze info solution with the name of my friend I have Id no.with the name of my friend Since company has shut down and his owner Anubhav mittal is in jail then how can we collect the more evidence Need your advise on this Best Regards Basant Sahu