Lama kamini vidrawan ras - Excess payment not returned by delivery boy

I had ordered Lama Kamini Vidrawan Ras feom Snapdeal which was delivered vide order No.*********** and it was cash on delivery. Rs. *** was total order value. I made a payment of Rs.**** inadvertently as I thought it was another order which was also expected to be delivered on the same day. When I checked the contents I immediately realised that I had made an excess payment of Rs. ***. Then I called the delivery boy who accepted that excess payment was received by him but he refused and did jot return Rs.***. The mobile number on which I made him the said payment is ********** and the name associated with it is "RAHUL". So please arrange return of Rs.*** to me.