False advertising! iStore turned me away!

I purchased an iMac from iStore Fourways, After talking to the sales consultant. I was happy with the product. After arriving home and un boxing the computer, I realised that I have not received the same bundle as on display. I went back to the store to look at the demo unit and price/description space next to the unit. The device on display has the Keyboard with TouchID and the one I received does not have TouchID. I call to speak to the manager and he makes some excuses and asked me to look at the website. I say that nowhere on display does is say that the keyboard is an optional extra. I advised I would be coming back later that day. After visiting the store for the second time. I spoke to a different store manager who called over the sales consultant and marketing person. They both confirmed that I should receive the bundle that is on display with the TouchID and that I should send an email with a photo of my bundle at home and send it through for it to be escalated. After doing so, I receive a response from the initial manager saying that I should have looked at the studio monitor next to this device and on that price tab it shows the TouchID as an extra, I asked why should I look at a different devices price list for details on the product I'm buying? then I get a response saying that I can exchange for an open box TouchID keyboard but I would have to pay in R3000. I refused. Then I receive a response saying that only the top 2 specs offered come with the touch ID, 256GB and 512GB model but not the 128GB model. I responded saying that nowhere on the price tag does it say that the different models come with different peripherals. They he called me to say I can return the 128GB iMac Bundle and exchange it for the 256GB model which has the TouchID keyboard but I need to pay the difference in cost between the two which Is also R3000. This is not okay. This is false advertising and false representation of the product that the customers see on display.