Bad service and incomplete accessories of the item

I arrived at the store looking for an LG sound bar and the store had the item on display,I asked to buy one, the sales consultant went to the back to get me one but instead came back to tell me that they are out of stock and the only one available is the one on display.i was given a choice of either taking a different brand or the one on display,I opted for the one on display,they offered me no discount and no gift for the used item. I then asked to see the Branch manager hoping that she would be fair enough to make me a fair deal but she was at no point of interest to my concern. After a long period of thought, I decided to take the item as it was on the same price because of my desperation. NOW, to my surprise after paying the full price,the item is being given to me without it's original packaging (the box), they instead wrapped it in that safety bubble like plastic and gave it to me,I did enquire about the packaging and they told me they throw away the boxes after opening the items for display. With utter dissapointment I walk out of the store. I get home to set up and I find that accessories are missing,2 batteries,1 optical cable,2 *****s & 2 wall brackets. What now???!!!!???