Indian Army — fraud on mobile phone, took my money

Don't fool yourself on name of army!!!
We were looking for a phone one plus 6, on olx got cheated big time!!!
So this army man mr. Sanjay singh fooled us big time, he made a deal of 20thousand and asked us to pay little amount now as advance and rest of the complete amount once the phone is delivered... Okay and pretty fine we agreed on this and believed as he is army official.. Now very next day we got a call from delivery boy stating us to pay the complete amount and some extra 3k as security deposit to get the fone delivered and will return the extra 3k on delivery.. He also promised us that he will be delivering the fone by next half n hour on this confidence we paid him the amount, after sometime he called us back again to deposit 3k more to get the delivery otherwise u won't get the money or phone back!!! This has literally left us in shock as we have given all the amount n received no phone pls help us 26thousand is big amount for us pls help
Kindly please share this post to expose these guys!!!
Sanjay singh :-[protected]
Delivery boy number :- +91 [protected]