Olx — fraud on the name of indian post office services

Address:

utsav, badi durga sthan gali, Simri baktiyarpur, 852127

I saw an advertisement on olx from indian army about a bullet bike. On further inquiry they told me that the newly bike costs just 70k and asked me to deposit 5k as advance payment, on doing so they again told me that i neede to pay 15k and 500 separately but due to lack of communication i deposited 15, 500 altogether. They then again called me and said that i neede to pay the amount separately i did as asked. As they were supposed to deliver the bike on my doorstep after that. But after few moments they again called me and asked me to pay 21, 500 and i understood that this was a fraud