Vodacom Upgrade Farce

We processed an upgrade order through the Vodacom website on the 7th of December 2018. The selected device was an Apple iPhone Xr 64GB in yellow. The site informed us that there was no stock available in this colour, but that it can be ordered and may take up to 6 weeks to arrive. To date, we have not had any feedback from Vodacom's side around the order or when it will be completed and the device despatched. We had to contact them today and query a status on the order, and was informed that Vodacom have never received this model in yellow, and that they cannot advise if they will ever receive this colour. We were advised that they have just received stock of all other colours. We also keep receiving SMS messages on the upgrade number, advising us that an upgrade is due, but on accessing the portal or the app, we are informed that the upgrade had already been processed. We were advised that there will be no device charge on the contract as we have yet to receive the device. We were also informed to choose one of the other colours that they received, or wait for the yellow colour without an ETA. Our frustration comes from being offered an option, choosing that option and then being told that the chosen option is unavailable and that they never received stock of that colour. What happened to the order that was placed for this device?