Terrible customer service

I went into the Little Falls store to purchase a book shelf. I was told the item I wanted was discontinued, but the sales assistant found 1. He said because it was discontinued he couldn’t find the SKU to process the sale, but he spoke to his manager and they made a plan. I paid extra for delivery. On Wednesday I got a notification that my item would be delivered that day, but when I got home they’d delivered a 2.4m awning instead of my shelf. I called the call centre and they guy said this probably happened because the item is discontinued and the dispatch guys could find a barcode so they just sent a different item! Over the next 2 days I called the call centre several times, they put me on hold to ‘call the store’, after 10+ minutes of holding, they cut the call. Anyway, on Friday they delivered the shelf and the swing I bought. Today we tried to assemble the items, but the shelf had missing pieces and missing *****s and the swing had missing *****s. So I log onto the website to log a return, and guess what? My orders don’t appear under my orders so I can’t log a return. Given I’ve been calling over and over since Wednesday to get them to collect the giant awning filling my garage without success and the shelf and swing don’t fit in my vehicle so I can’t return it myself, I’m guessing I have a huge problem and Leroy Merlin simply couldn’t care less. I’ve been a customer since they opened in SA and this is just so disappointing and frustrating.