@Home terrible service

Worst service ever. A few weeks ago I needed to purchase a bed with 2 pedestals, however the bed was out of stock so I had to wait for them to restock before making a purchase. I then got a notification saying that the items I want was available for purchase so I made the purchase online. I got a call approximately 3 weeks later saying my items were going to be delivered. The guys came to deliver only to find out it was only the bed and not the pedestals. I called in to the online call centre only for them to tell me that the pedestals are out of stock and they cannot tell me when they will be getting in stock again. Firstly, I struggled to get a delivery date from them, now I haven't received my complete order! the items were in stock when I made the purchase and now all of a sudden no one knows when I will be getting the pedestals and nobody can assist me! The drivers who delivered and assembled my bed even advised that I should complain because they are messing with me! How do I go about this???