Cheating-not returning my money back

I planed to purchase one plot (site) in bangalore east in apr 2016.i contacted the number board put in the plot.The person is ashok,he resides in bidar town, karnataka and working as clerk in session court ,bidar town.he told that site belongs to his younger brother who resides in US and he is looking after that for sale.I have seen the GPA thru US embassy given by his brother and got confirmed.I also enquired in layout and got confirmed that plot belongings to them. I met him in bangalore ,he demanded 1 lakh Rs for giving the site documents to me for legal verification.He also told that if it is legal rejected he will give back the amount back.I liked the plot, i believed him and transferred amount to his sbi account thru online and in bank transaction description i have written that "site advance".my collegue also with me during all these conversations. but i have not put any agreement with him ,also not recieved any cheque from him, i have no written proof .but the plot documents legally rejected so i am asking him to return my money. i resides in bangalore ,he is in bidar which is 400 km away,whenever i call him to return my money back, he will tell that he will give next week like that but from june 2016 to till date he is telling like that but not returned my money back.but all the phone conversations i recorded in my mobile. He has done similaly with one more buyer but that buyer has taken written letter from him for amount recieved.but for him also not yet returned. now i need legal advice how to go about to get back my money. my friend witness,online bank transfer proof,mobile audio recordings is it sufficient or need to collect any more proof as witness kindly advice. what steps should i take?what is the chances of getting my money back.? If i need to file FIR where to file in bangalore or bidar? kindly guide me? I am in urgent need of money now,its a hard earned money,i require one year to save one lakh rupees.