Facebook - Facebook froud as a name of ARMY

In facebook someone given an ad for a few products to sell parson name is Amit i called him on mantioned no ********** he said that i am from Indian CISF now posted in Mohali airport i got transferred to Jammu within * days I will go from here i want to sale the products urgently I asked him that I want only bed the deal was in **** he said that *st you need to pay **** the bill will be issue from the army courier team rest amount you need to once product will reach at doorstep then he has issued the bill and forwarded the snapshot to me on WhatsApp said that someone will call you for the product delivery after few minutes someone called me said that wrong bill has been issued you need to pay **** more pay **** then I talked to amit *st person i told you you said that he is asking to pay **** more he said wait i will talk to him after few minutes he called me said wrong bill has been generated please pay **** again I told him their wouldn't be any kind of froud he said i am a army person and trust on Indian ARMY Apart from TRANGA nathing for us then I paid **** after that anther person call me bill has been issued i am coming from here with in few minutes I will call you thereafter he called me said that amount is not paid as par policy you need to pay ****+*** again I called *st person amit I said you people are doing froud with me for the trust i asked him to make video calls he called me and he was in army dress and me convince me said that you are not turesting on ARMY we are always on duty to save you people then I paid the amount then another person called me said that I have taken the entry from * but gate on *nd gate they are not allowing me to go they said that GST not added in bill you need to total **** togather then I said I will not pay the amount he said if you will not pay your paid amount will be hold for *month and product delivery will be cancelled as par ARMY courior policy i denied again for the trust he sent me his id card and said i am on gate please pay first then I will take entry from here and with in few minutes I will deliver the product at your doorstep then I paid after paid he called me again said that need to pay **** again then I will get the entry from here then I didn't pay
AS ALL INDIAN PEOPLE TRUST ON INDIAN ARMY but few few people are doing froud as a name of them

Please help me how can reverse back my amount