Ecom Express — fake product

I ordered 25000mah Samsung power bank from www.unitarian. in video order number[protected] . I received a pack supposedly having above mentioned power bank delivered at my home. but to my surprise on opening this pack it contained a fake item which is like a toy .it is quite useless and worthless.I immediately called the delivery boy from my cell to the cellphone from which I had received the call for collecting the parcel but his phone was not reachable. I tried to search through www.unitarian. in but all in vain.
kindly help me in this regard