Indian Army — Olx ad product selling

My husband Nanda Patra saw an ad in olx posted my Indian army officer Siva Kumar he wants to sell his bed almirah tv sofa set he asked for 6k advance which my husband paid through gpay and then he asked for 10k GST and 500 for parcel courier he mentioned he will do it through Indian army transport then my husband paid 10500 again after that we had some doubt and we asked for return he denied to do that even deleted ad from olx
It is a fradulant case can we get the money back total 16500
Please help us