Screen replacement not honoured

I upgraded my contract on August 2015 and got a Samsung Galaxy S7 Edge at the Vodacom shop in Highveld Mall, eMalahleni. After I started my device up I installed ADH Premium and made sure my device was covered. A week ago I went into Vodacom after my device fell and the screen broke and then the consultants told me that my phone will not be fixed and that I would have to pay R5500 to get the screen fixed. I assured them my device was covered for two years and that I had two screen replacements whereafter they told me that Samsung will not fix it. They also told me of a client that had their phone for 5 months and Samsung refused to replace her screen. I fail to understand how my phone cannot be fixed when I was indeed covered and also why Vodacom didn't even want to assist.