forcing money out of pocket

<p>I bought a Samsung s6 in December 2015 and i was told it has a screen guarantee for 12 months. 2 weeks back i wen to the Sandton voda repair and on my arrival the lady confirmed that i have a guarantee but then she saw a small crack at the back on my phone which has nothing to do with the screen and she then said to me she has to quote me for R1500 for the small crack at the back. What does the crack at the back has to do with my screen? i dont want the crack to be fixed but only the screen in front to be fxed. This is pure day ligt *******, is the word "guarantee" just a selling word?</p>