Unit returned with more damage then when booked in

I booked a Samsung Microwave in for warranty repair on the keypad. A day less than a month later I got it back, the keypad was working, but the door didn't open properly, and there was physical damage on the microwave - specifically, the section that houses the keypad.<br> <br> I had terrible service from HiFi Corp, and have lodged a complaint with them, but Regan, the branch manager at HiFi Corp Westgate, told me that Samsung was responsible for the state of the Microwave I got back.<br> <br> I'd like some confirmation of who was responsible for the damage.