Online order incomplete and no effort from GAME Fourways to rectify

I ordered 10 containers with lids from GAME online. The order was processed and sent from GAME Fourways on Sunday, 12 February. Only 8 lids were delivered, the person who delivered the items were aware of the shortage, and said that he had to give me a message that the outstanding lids would be delivered during the week. However, I did not receive official communication regarding the missing items, and the delivery note indicated that the order was delivered in full, hence I sent an e-mail to the web-support in order to make them aware that the order was not delivered in full, and that the outstanding items will be delivered during the week as per the message received from the delivery guy.

Game Fourways contacted me on 16h11 on Thursday, 16 February to "inform" me that they are unable to get stock to deliver the outstanding lids. I told the lady that it is unacceptable, and that I don't accept the "reason" and that I expect delivery of the missing items. After finishing the call with Game Fourways, I immediately went online and placed an order for 10 more of the exact same containers, which was delivered the following day (Friday, 17 February).

This indicates that stock is not the problem, and that Game Fourways did not even bother to find stock in order to deliver the missing items.