Indian Army — mobile seller fraud saying from army

Address:

South Goa, Goa, 403713

I had gone through an advertisement on olx for a phone sale redmi note 7 pro he said he was from the army and asked me to send the advance 2000 by paytm cash and the courier guy will send me the parcel later evening the courier guy calls up demanding information and asked to send the balance amount that's 6000 other you will loose your money and everything will go in the government of india funds so i transferred it trusting the words he said as of an army officer later he demanded more saying the transaction wasn't compleat you need to pay another amount thats 5150 as army insurance other wise the phone will not get and your cash will be confiscated the payment mode was done by google pay aging he calls up and asked me to do the transaction otherwise i'll be in trouble a complaint will be fined on me i unfortunately having no other opting send me him another 5150 the total of 18300 after that he started demanding more for the reverse mail from the army i said no i want my money back they stared not replying and miss using my phone number
I have complained to the olx and also the police but searching for more help dint expect such thing i would like the authority handling such frauds to look into the matter..