Indian Army — buying iphone 7plus through indian army courier service.

Address:

Kamrup Metropolitan, Assam, 781005

Sir,
I am gwmsrang basumatary from guwahati, assam. One person named shrikant his phone no. [protected] / [protected] and his google pay no. [protected] had fraud me in the name of indian army that he is selling his iphone 7plus mobile through indian army courier service which has been advertised in olx at the price ₹35000. He agreed to sell his phone at ₹20000 (On 4th march, 2019 time : 01:20 pm), as the deal is done. He told me parcel will be delivered to me within 24hours, later on at evening first he asked me to send ₹5000 as he have to send money to his wife for some family problem. So i send him ₹5000 at evening at maybe 7:00 pm. As he have send me his id card, adhar card, job id card as a proof and in return he also asked me to send my id card for proof which i have to send him. The next day he called me and asked me to send the money, as i was busy i told him to wait and told him i will pay the money as soon as i receive the parcel.
After few hours one call came to my phone from no. [protected] as i recive the cl he told me your parcel is on the way waiting for delivery. When i cut the call, a call from shrikant rang he asked me to send the rest of money ₹15000 which he have to pay some amount of money to courier service... I send him the money and when i went to pick up the parcel so again the delivery man called me and asked me to pay ₹6120 to company/courier service where ₹6000 is refundable and ₹120 is charged as fine for late insurance deposit or something else. I got confused what to do now, i have also send the money to him. Now i don’t have any way what to do so...
I have lost ₹20000. Please help me find out my money back and make them pay for making fraud what they have done to others, i am a student and its a very big amount for me, for everybody...