Treated like a non-entity and insulted

I bought a Sansui component system on Sunday (06 Dec 2015). I asked the sales person if they will be opening the box to check if all components are in. I was assured they were in with no need to open the boxes. When I got home, the amp was missing. I phoned them the next day and was told to bring back the goods of which I did. When I got to the shop and explained the amp is missing, one of the sales person was not amazed as he knew that the box they gave me must have been the one with the amp taken in for repairs/service. He assisted me in getting another box with all the component and he opened it and we checked everything was in. I then asked, the manager how was I going to be compensated for my time, travel and inconvenience. She sarcastically asked me if \you want discount