Rapid Delivery - Got a product from an unknown company

I received a product from an Unknown Company. I asked to return the product from the same courier boy they refused. I asked the company from the company but they gave the number of another courier service.
I called that courier but they refused tell the name of the company. Here is the chain link
Customer---×Velex---×× Ship delight-----×× Rapid delivery(Refused to tell further)

*)Velex Courier boy-**********
*)Velex supervisor- **********(Rajesh)
*)Ship delight---×***********
*) Rapid Delivery- **********--Sejal(Denied to tell the name of company)

Now I just want to return the product but nobody responses of above mentioned name where to return this unwanted product.