How can I recover money lent to professor after asking multiple times

I am an MBA student. 1st October 2015, my law subject professor on WhatsApp said his brother is critical, and asked for help of Rs.4,000 and will return next Thursday. I gave Rs.5,000 in cash, in hand because I knew how hard is it to get monetary help in such a short notice. He is LLB and MBA from IIM-A, so I thought he won't cause trouble. For long time, he didn't say anything about returning the money, Said his brother is dead, I became suspicious that he may have plans to keep the money. I brought the topic up one day. He said he'll return next week. Then he said his another brother is dead, wait one more week. Then 3 days, then 2 days. Then again a week, and I realized that he is not saying no, but making me beg. I've informed College Director, Admin head, Dean and some professors. Then he agreed to give cheque to dean, and I can take from there. He didn't give it. 15 months, calls, SMS, face to face meeting, everything is done. I have everything on chats & SMS.