Online Clothes Purchase Scam

some day ago i order one suit online and pay 1350 ruppes but after 4-5 days delivery boy come and said that sende 1550 ruppes. when I ask for what he told that it is your first order from over company. I have doubt so I told him to cancl my order and send me my refund . But he denied that without your signature your order not cancelled when I asked where I sign the he again told that when you send 1550 payment i will bring your order and also give your m back but I denied for payment then he blocked my number and I losty 1350 rupees