I DO NOT LIKE THIS! :-(

I bought a Samsung Galaxy S4 in 2013 from Cell C wonderpark and activated the ADH (the 2 time repair warranty against water of physical damage). The phone's screen broken (but the phone was still working) and it was taken in for repairs, it was fixed (meaning i am left with 1 repair warranty/ guarantee). Now some time this year the screen broke yet again. The phone was taken in for repears and they fixed the screen but the phone still did not switch on. The phone was then taken back to Samsung and now this is what i do not like: they say it will cost R1900 to repair, now i did not understand why we haveto pay because it was under warranty. I then called them today (17 March 2015) and spoke to a gentleman by the name Ken, who then referred me to Liz who i called on this number ***. After calling her she said that the phone will cost R1900 because BOTH warranties were used the first time the phone was repaired because of the extent of the damage. That does not even make sense! The warranty said i get TWO chances to get it fixed, it said NOTHING about the extent of the damage. How can one repair account for two? and why were we not previously informed? That really upsets me!!!