Indian Army — mobile phone purchasing

I saw a mobile ad in olx...so i texted him..then he told me that he is in u.p...and i m in kolkata..so he sent me his id card and adharcard...then he told me send money..which is 1500..i send him 1500 then he asked me for more 7500...i send him more 7500...then the courior boy called me and told me that parcel was hold...i[censored] unhold the parcel then i need to pay the penalty which is 4150...then i send the courior boy 4150..again they asked me for 4150...so again i paid that...again they asked me for 8300..i laid them...then again they asked for 20000..i paid them...again they asked me for 4200..i paid that...