Pickrr Technologies — received duplicate power bank

Reference id : [protected]
Order id : 816425
Tracking id :[protected]
Dear sir i order samsung power bank of 25000 mah on 17/8/2017. But what we received is 20000 mah duplicate samsung power bank. So u please take back this power bank. And no where it is written samsung on power bank it looks 100% duplicate so plz inform us how to return it back.