False information

At the beginning of March, I had to upgrade my children's phones, and switched to Cell C. My son wanted a Samsung Gear S2 for his birthday, but as they were not available yet, I asked the salesperson who attended to my upgrade, if there are specific phones compatible with the Gear, they told me all smartphones with android 4.4 and higher 1.5 GB RAM will be compatible, as per Samsung's website as well. As I were looking at the Samsung J7, they confirmed that it will in fact be compatible. He also told me that I will be able to get a contract on the Gear separately, once they do have stock. I thus proceeded with the contract. Now a month later as I enquire about the stock, they inform me that the Samsung Gear S2 is only compatible with the Samsung S6 & 7, and you need to do a contract on the two together. So now I sit with a phone without a Gear and my son without his birthday gift. Why is the suppliers not informed with the correct information?