Worst experience from an online shop ever

I ordered 2 items a day apart 18/19th April and I ordered them because both items were "In Stock" at First Shop and I needed them quite urgently and because this is what it says on there website : "Fast, reliable delivery" "We deliver nationwide from our multiple warehouses throughout SA". Under "When will I get it" on the website it says 2-4 working days for CT. 1 week later 25/05 the status of both orders were still "Unfulfilled". I asked and was told : "Kindly note that we have experienced a slight delay with invoicing and dispatching of your order. We are working on having your order delivered to you as soon as possible. I have followed up with the warehouse to urgently advise ETA." THIS IS FOR SUPPOSEDLY IN STOCK ITEMS!!! Of course I never received the promised ETA. On the 2nd May I received 2 invoices. I think I was supposed to deduce that the receiving of the invoices that they had been shipped. So I asked on the chat function on the website and this is the reply : "Your order has been shipped on 02 May, however, I regret to inform you that I currently do not have any tracking information available." WHY NOT ? Don't you work for the same company ? So I asked customer service and finally get tracking numbers. Then the parcels sit at the courier for another week and then only 1 gets delivered. I contact the courier and they inform me that the 2nd parcels address is different to the first and that's the way they received it from the sender. Then today 12/05 I get this email : Kindly note that your delivery has failed and has been returned to our warehouse. Kindly advise if we can place a new order for you or if you would like a refund. " 10 mins later the parcel is delivered. 16 WORKING DAYS after ordering an IN STOCK ITEM. This was the first time I had used FIRSTSHOP and will be the last. Of course on the order status page it still says the orders are "Unfulfilled"