Student — for mobile

I saw a mobile on olx. Which is sell by bijendra kumar in 8000. I make this offer in 5000. Then he say you pay 500 for send your mobile. I paid money. Then he saw agter some time send 500 rs. And second day he say your mobile is on way at first you pay 4000 money. I say when i receive mobile then i pay 4000 rs. He say your parcel is to stop in your city. I paid 4000rs. I paid full payment of the mobile. Then the courier partner say your parcel is too late so you pay 2100 rs. And 2000rs. Is cashback. I don't found any cashback. And i lost 7100rs. After this he is not receiving my call. I have his mobile number. Vijendra kumar mob. No. :-[protected]
The mobile is samsung j8.