Refusal to exchange power bank

<p>I bought a Javelin powerbank from Jet Sunnypark last week Sunday. After using it for a short while i realised that the power supply from the power bank is on and off and therefore failed to provide the power that I needed. I packed the power bank including ALL accessories back into the box to return it to Jet Sunnypark. When I got to the store the cashier ripped the box open and a hook that came with the powerbank, that I personally packed into the box got misplaced . As a result the cashier refused to process an exchange because she could not find the hook that probably fell because she ripped the box.</p> <p> </p> <p>Now I am stuck with a powerbank that does not work because of a hook that got mispalced by the cashier.</p> <p>This is really unacceptable, as I personally packed the box myself and know that the hook was in the box .</p>