I thought MTN was bad but I had no idea...

We purchased a data contract and ****le for his Macbook Pro, he was sold a ****le that isn't actually compatible with the latest OS X operating system. After returning to the store they downloaded an update, and still, it didn't work. We then went to the iStore thinking there was something wrong with the laptop, and we were told that the data stick we'd been sold, wasn't compatible with OS x 10.11. So I went back to the Vodacom store to ask them to please just exchange the ****le for a wifi one, as suggested by the iStore consultant. The manageress told that I needed the packaging. So I went home and dug the packaging out of the ******* bin, and returned to the store. She looked at the torn packaging and said they couldn't accept it. I told her that they'd sold us incompatible software and she called her boss, Werner Kruger, who told her that it says on the box it's compatible with Macs...but we can't get it to work. She then told me to go to Hyde Park where there was in IT specialist who would set it up. Off I went, only to be told with a shrug at the Hyde Park branch that he wasn't in today. Having researched it, there is an update, I downloaded it but still it doesn't work.