Indian Army — Indian army online parcel service

Hello sir, i ordered a mobile phone in olx, the seller introduced himself as cisf constable named srikanth singh ([protected]), he fixed the rate at 4500/- rs and gave me a google pay number ([protected]) and ask me to pay there 520rs as advance. I paid that on 7/7/2020 in morning then he told me that courier will be delivered at my doorstep by 1:30pm on the same day. Then after few hours a courier boy called me ([protected]) introduced himself an indian army courier service and ask me to pay 3100rs to that account then he will handed over the phone to me and also told me that amount will be refunded within 5min because that is the security amount to the courier service. I talk to that seller and ask him he also said the same. Then i transfer that amount to that google pay account. Then again they called me and ask me to pay 5999rs as late fee which will also be refundable after few minutes, i refuse to pay that then they told me that if i didn't pay that they couldn't return my money for next 2months and the phone also. Then after many argument i paid them then again the ask me to pay 10089rs, then 8100, then 8000, then 5100, then again ask me for 3100 i stop there. Then they didn't refund my money in total 40890/-rs and the parcel too.
Sir please help me. I am a low middle class girl. That was my only amount. I have no money now. Please help to find them and recover that amount.