You have good case against him for recovery of money. There is proof of payment and repayments by him. Issue lawyer's notice seeking payment with interest and then file suit for recovery of money.
For filing suit for recovery of money you need not come to India, Draft a GPA in favor of you friend/relative on 100 rupees bond paper or even on white paper giving him power to file suit on your behalf. Take that GPA to Indian Consulate/High Commissioner and get it attested by official there. Due to pandemic walk ins to consulate are suspended you will get the attestation online. The GPA has to be in specific format. Send it to the person named in India. He can do everything appointment of Advocate, filing case, etc. for you. Engage a senior Advocate , you can recover you money with interest and costs of litigation. For further clarification you may contact me through Pathlegal. Hit the like button if the advice is useful to you.