Loan shark is harrasing me.

I have taken 8 Lakhs Rupees from a friend on 120% PA through bank to bank transactions from 1st june 2023. He has transferred the money to me through his mother in law account and some amount through his sister in law account. I have repaid almost 21 lakhs till now through bank to bank transactions to his mother in law account. And 3 lakhs In cash to him. Now he is saying that u had not paid on time and hence he has compounded the interest amount and total by 1st September I have to pay 25 lakhs more. I told him I will pay him 20 lakhs and settle matter. But he says if u ll not pay 5 lakhs then he will compound the intrest on that and keep on continuing till I paid Everything. He says that money is of some builder who is also a big goon. If I will not give he will come to home and threaten my family physical violence and all. I have received money not from builder directly but via his mother in law account. I have also paid the amount through same account only. I have all the transaction details to show. What should I do?