Indian Army — trapped in 21000 for iphone 6s

Address:

411001

I met him on olx and he trapped me in for paying 21000rs for iphone 6s rose gold 128gb used for 7 months.
He asked me to send advance.
And then next day a courier guy called and asked me that courier is around me and needs full payment plus gst.
I paid for the same and then courier guy vanishes.
Next day manjeet singh calls saying the parcel is coming to raipur and he will put delivery again.
Please help me retain my money back.