Indian Army — Indian Army- Rs.21000/- fraud happens with me by taking indian army name

I placed an add of Khes saree on facebook marketplace.A person called and state that his name is vikash Patel and he is in Indian Army and want to buy 10 sarees. He send me his address.The total amount for Rs.7000/-.though I have a phone pe account so he agreed to pay me. During the process of payment he send me a qr code for Rs.5/- from Jitender Singh mobile no.He told me when I scan the code and send him for Rs.5/- and automatically my balance credited with Rs.10/-.So I was satisfied with this transaction. After that he said now he will send me Rs.7000/- qr code and when I click send option then Rs.7000/- will debited from my account and Rs.14000/- will credited to my account. Though he is related with Indian Army so no confusion arises in my mind. I thought that this was may be the payment process of Indian Army. So I scaned the qr code and clicked on send botton. But unfortunately process was failed. So he said that he send me another qr code from the another person's named Mukesh Singh's phone no. So that person send me another qr code for Rs.7000/- and when I scanned and clicked on the send botton the amount had debited from my account but Rs.14000/- not credited to my account.They told me their amount has been stuck during process. So they want to send me another qr code for Rs.14000/- and I would received Rs.28000/-. But this time during this process Rs.14000/- is debited from my account but no amount credited to my account.They said some problem arises during the process to refund the amount and told me for the last time they will send me qr code for Rs.28000/- to complete the transaction.Then I realised that something wrong with me and this is totally fraud.
Details of the person is:
Vikash Patel ([protected])and ([protected]).
Dear Sir,
I want my money back...this type of fraud happened taken by Indian Army name.
Kindly take quick action.
Thanks