DEAR DECOFURN NORTHRIDING, DELIVER MY 'PAID FOR' ITEM OR I WILL TAKE LEGAL ACTION!

It has been over a month now since i have been waiting for my missing item to be delivered. I bought over R 13 000 worth of furniture from DecoFurn Northriding on Black Friday. The rule is, if it is in stock in the warehouse, the black Friday deal applies. All my items were in stock. I was the first customer in the store. I was very organised. I had been there prior to black Friday to find all the furniture i wanted. I had a list and pictures. I was in and out very quickly. All my items were meant to be delivered that next Saturday. All my items except my corner desk was delivered due to an apparent 'out of stock' issue. Which means that the item i purchased was given to someone else! I have emailed heads office and called the branch several times (when the actually answer the phone). All of these were filled with empty promises. I am on my final nerve right now. I paid for my item and i want it delivered now. I will take legal action because this is ridiculous!! This is unexceptionable! i have been waiting since the 23rd November!!!!!!!!! DELIVER MY FURNITURE NOW!! ALSO REMEMBER THAT I PAID FOR INSTALLATION !!!!!!!!!!!!!!!!!!