Indian Army — cheating money

Address:	Gaya, Bihar, 823001
Website:	Olx

I am aviraj sinha, hereby want you to inform that i wished to take a second-hand phone so i've seen one mi a2 add-on olx website.

I talked to its owner that i'm interested in buying that phone.
He agreed and the deal was done for 6, 000/-
He told his name as somnath giri, lives in delhi and works in the indian army.
I asked about proof, so he sent his aadhaar card photo and his i'd card proof from it i beleived on him.
I was interested in this deal so i continue talking with him.
He said that i will get that phone within 12 hours. To shipping that parcel he demanded me to give 1000/- rupees. After 12 hours 1 person called me and said he is from indian army post office and he is a postman he demanded me to gave him 5000 rupees after it he will send my parcel within 20 minutes i gave him 5000 rupees for delivery but again he called me and told me to gave him 3150 rupees as a security charge after delivery he will return my 3100 rupees then i again gave him rupees as security charge but again after 15 mins he called and said that i send him a wrong payment because he said to do two transaction as 3100 rupees or 1 and 50 rupee of 2 transaction and he said that statement to deliver my product is not getting ready and he said to give him again 3150 rupees as security charge in 2 transaction i was trapped in his plan and i want to getting my previous money back for this reason i gave hi 3150 rupees to deliver my product but again he called me to gave him 6300 rupees as fault of my first payment after it i didn't gave him any money.
Now he is neither sending my parcel nor returning my money back to me.
I just have his aadhaar card photo, i'd card proof and his paytm transaction number.
I just hope that you'll help me to come out of this problem. And return my money back to me because it's really a big matter for a student.
I'll be waiting for your reply.