Poor quality blamed on me

I am super annoyed with Smsung as I have booked in my A3 for repairs after the screen suddenly stopped working. Before even the phone was booked in they told me that I will pay because of a scratch which happened a while back, that they saying is physical damage. My phone was working fine and then one minute it stopped working. I now have been given a quotation of R 1200 to fix it which I am NOT willing to pay. This is my last time using a samsung product. Never again!!! <br> <br>